This is just experimental for now, to keep me off the streets.
Zoom B3n, HX Stomp, MOD Dwarf - several preamps but they are more pre than amp, so the signal level would probably be too low just using those. A simple amplifier with a gain of 10 or so should do the job if necessary.
Not a lot, I would think. When I've dug a J-J speaker lead out, I'll see what a Hotone 5W amp sounds like through it.
That's the idea. Everything is subject to change.
USB-C, either from a power pack or a mains adaptor, preferably variable voltage.