Thank you for your feedback! I read your very interesting thread (
https://forums.macrumors.com/threads/undecided-12-or-12-mini.2286006/) which is giving a lot of great inputs for whoever is in the same situation (torn between the iPhone 12 and 12 mini).
Maybe the best option would have been an iPhone 12 5.8"

Same 11 Pro screen size and smaller body (as they actually did for the 12: Same 11 screen size and smaller body.
Nevertheless, I think that for me the approach could be to buy the iPhone 12 mini and test it over 10-14 days (as you did for the iPhone 12) and then come to a conclusion/decision.