Not quite what you want, but in dolphin you can open a terminal with F4, and then just type sudo deb -i <package.deb> and your password. Pretty quick.

I’ve been using it full time for 21 years, and dual boot for years before that. Early on it definitely took up a bit of time, but that’s mostly because I was interested in breaking things and learning to fix them. Even 10-15 years ago I don’t think I would have spent more than a few hours a month fixing things. These days it’s a few hours a year, and that’s only when I start messing around with something in a careless way.