A used MK3S or MK3S+ might be better for your desires. They have an 8bit board but you're free to flash the firmware for marlin or klipper and you're free to flash it back to prusa. The 32bit boards on the mini and MK4 require you to cut a resistor to do 3rd party firmware.
The MK3S and S+ work well with octoprint. The mini has it own wifi but really slow upload speeds and and uses the somewhat clunky prusa setup.
Used Mk3S and Mk3S+ are readily available with everyone trying to sell them and use the money to buy a MK4.
Down sides to the prusa are there aren't a lot of mods, people like their reliability, ongoing support, and other aspects so they don't mod them as much as other printers. I've wanted a better part cooling setup, there aren't many out there and the printer as is is definitely good enough that I keep going as is. I am as guilty as most everyone else in not designing the mod I wanted.
Alternate grilled cheese hack. Heat the skillet on medium till the skillet is hot. Really wait a couple minutes till it has come up to temperature. Melt a pat of butter on the skillet - don't tear up you bread trying to spread butter on it. Cook the sandwich for one minute in the butter, move it to the side then melt another pat of butter in the empty space. Flip and cook the other side of the sandwich in the new butter. One min+ a little on this side.
Bonus look up inside out grilled cheese sandwiches and do them this way.