Heretic of The Seventh Circle
Honestly making all short rest stuff able to be recovered as an action PB/LR works fine. Probably the easiest way to go. Just note that it can be done as part of a short rest, keep short rests as a healing resource usage gate but make them shorter as the core rule with longer short rests turned into the variant, and the game runs like a dream.Changing Fighter (particularly BM) and Warlock short rest ability recharge to prof times per day probably wouldn't be excessive, as long as you don't allow everything to be used in the same fight. Even just requiring an action to refresh the abilities would reduce the nova potential and set up meaningful tactical choices.
Stuff like the warlock would require more specific wording otherwise, perhaps a table.
Which is why I don't actually think we will see the end of short rests. It's doable, but pushes the game over the line into "needs conversion to work together" territory, if you get rid of short rests altogether. I don't think that any significant general rules will change.