I've looked for years and there is surprisingly little out there on combining them to in any detail. I've also asked people like Roli Delgado, Cavaca and Norbi Nowak specific questions at seminars on it too because its so hard to find anyone showing the two fully integrated. Most stuff is along the lines of 'fall back with his leg, better stand up to pass if you can't tap him'.
I'm sure you've already seen it too, but just to name the most obvious, Reilly Bodycomb's Top Rock 2 (Top Rock 1 has similar themes, but isn't as pass intensive) is directly about this topic. It's pretty much nothing but passing directly from leg entanglement positions rather than standing up and restarting. I know there are certain people on here that give him massive shit (both for being a middling level competitor (fair), and for his past personality (unfair)), but it is a direct answer to your question. For example, he shows a decision tree where you start in a modified inside sankaku, your opponent defends in a specific manner, so you weave your leg and pass to knee on belly.
Also, be patient! Now that leg locks are the nogi meta (in no gi, at least, until the IBJJF mans up and allows Gi heel hooks), we're going to see leg defenses rise, so transitioning from guard-->leg entanglement --> transition to top control/back will hopefully be the next meta, and then all the high level competitors and geniuses will figure it out for us working class bums. It'd happen faster, but people are fine entangling, losing position, looking for a re-tangle, and lasting until overtime to be automatically gifted back control, which takes the incentive away. Thankfully the ADCC is still a thing.
garry tonon kind of does it because he ends up in leg lock scrambles very often. I think you can find matches where he takes the back from failed leg locks but the truth is that most people won't give away a leg lock for a simple pass.If I have a secure leg lock ima try to finish the sub, a transition via leg lock should be fast that's why the standing leg locks work for you because you don't have to interweave your legs and you move only half of your body , if a 50\50 position is achieved you will need momentum to get up so the motion has to be non-stop or you can roll under and go for the back, I guess.
I see that being how things are now, but not forever. Just because you've gotten into the beginning phases of an armbar position doesn't mean you'd hold on to the bitter end and give up the pass. Once you know enough about the positioning to say "Shit, this is a lost cause, I gotta do something else" (a phase we're just now entering meaningfully with leg attacks), you're going to start looking for options. You can transition back to open guard (the equivalent of just restarting passing from a failed leg attempt, which is a skill in and of itself, to maintain top control after a failed leg attempt, which will probably be cultivated first), or you can use the position you have to effectuate some manner of sweep (getting to side control or back directly from leg entanglement) or use your opponent's defense to transition to a more advantageous guard (coming out of a leg entanglement into the early stages of a guard pass). Then we start moving to full integration, where we know exactly what body postures lead to an efficient situation for a pass or a leg lock, and have mapped out decision trees, and it becomes boring and something new happens. It's like berimbolos. They were "the thing." Then reliable counters or preventions were found, but then that led to other opportunities that ended up being exploited. Now it's a cohesive system; there will always be specialists, of course, but the general populace (and usually people who become GOATs rather than kings for a day) will understand EXACTLY when the opponent's body is in the best configuration to employ that previous instant win button (as otherwise you'll just get countered if you blindly spam it), and it becomes just another tool within your guard system, to be used when your opponent is in a certain posture. You see it with everything in BJJ, because it's still growing. Believe it or not, there was a time where Spider Guard was such an "I win!" button (or, to be more precise, an "I can't lose!" button) in BJJ that there was an outcry to ban the position. Happened with 50/50 too. Everyone's gameplan turned into "spam spider (or 50/50) and win because it's fucking magic." Nowadays consistent high level players just use these positions tactically, at the best moments possible to use them, and once it's time to move to a more advantageous entanglement, they do that.
You find undiscovered land, and it's fucking great. But then people start learning the outer edges of where the technique starts to fail, until you hit a defined area where you can see pretty clearly where the failure and success markers are. Then you gameplan accordingly.
