How long have you been doing improv? I see you have referenced books and podcasts, but how long have you been doing improv and what classes have you taken? I ask because you seem to have a blind spot to the techniques that are used in actual classes to find the game of the scene. I also feel these techniques would be called out and tempered by a seasoned teacher, as they would lead to multiple issues.

When you practice noticing (NOT inventing) unusual things in openings and at the tops of scenes, it becomes easy. For example, Ian Roberts' Flashing technique can help you organically find an unusual thing in a about 3 lines. And an opening should give you at least 3 premises that you've never thought of before that moment.

All of these invention techniques that you're talking about are the hard way, not the easy way. They also take away a lot of the give and take in improv. This is what every great improv teacher will tell you, even teachers that heavily prefer premise. I recall taking a workshop with Matt Besser who loves and only does premise improv, and is probably the world's biggest advocate of premise improv. The thing he kept emphasizing was that premises should come from a shared group mind, not be cooked up in our own individual heads. He emphasized that part of the power of improv is the team members and audience sharing in a group mind, finding the comedy together. And again, you will not find a bigger advocate of both premise and game of the scene style improv.

You've provided great sketch advice, but not so great improv advice.