Ideally you’d get something like the Thingstone Track8, but that is €1800.
Then there is the LMN-3 open source hardware DAW you can build, its surprisingly powerfuil.
But the most immediately practical choice is IMHO a 1010music Blackbox, it has excellent loop recording options, and a sequencer, so you can easily build complete tracks from whatever source material you want. You can get it used for less thant €400. I used that a lot for a about 2 years, before I moved on to a hybrid setup.
Here’s a couple of vids that show you how it works and what options exist for seamless triggering:
