There's Faderbank 16n listed on this site that I believe outputs midi, cv and i2c. https://16n-faderbank.github.io/

For programable controllers, the Launchpad series from Novation is pretty handy. I've seen it configured as a sequencer controller among other things.

Sans the Bluetooth, something like the AKAI MPK Mini might fit? Not the greatest of keys, very plasticky, but it is cheap and has pots, keys, pads at least.

Strangely enough no. There used to be some M-Audio 25 key offerings, but seemingly no longer. A MIDI->BT dongle is about €50 though.