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What fully-featured handhelds are people using in 2020 for running LGPT?
I'm using a Circuit Sword by Kite. USB MIDI is great, a dedicated mini-TRS serial MIDI would be greater.
The sound chip is awesome. Based around a CM102S+ USB audio interface, it has a built-in Dynamic Range Control, aka a master bus compressor that can be used for fun and profit.
My main complaint about Kites Circuit Sword is that the shoulder buttons are placed inconveniently for my weak, carpal tunnely hands. Also, the audio volume isn't very loud out of the box and requires manual hardware hacking.
I'm considering designing a handheld with a Gameboy Advance SP form factor and I'd like to make check of interest check for a project like this with good assembly instructions.

The unit I'm envisioning would run on a Raspberry Pi Zero (or maybe even a Banana Pi M2 Zero if I'm feeling adventurous).
This would be available as a DIY kit requiring soldering and light GBA SP case modification.
It will run the RetroPie distro and boot directly into Piggy and will therefore be able to run a plethora of retro games if one wants to switch to LSDJ or when one wants to kill time in between beatmaking.

This unit would have the following features:
Dedicated RetroPie image, aka burn to SD card get piggin'.
GBA SP form factor requiring minimal case modification.
Audio jack with volume that can go loud enough for plugging into a mixer.
A master bus compressor that can be "pushed" by adjusting the Piggy project / sample volume.
MIDI in/out over USB and / or MIDI out via 3.5-TRS jack.
Safe shutdown
Project available as a guide for sourcing parts and how to assemble it.
Cost of approximately $100 depending on how you choose to source parts.

My questions to you:
Is this project relevant or is there already a unit out there that ticks enough of these boxes?
Would you prefer USB MIDI or UART MIDI?
Do you have any suggestions?
What are your unanswered questions?

I've read a couple of threads that seem to imply that there is a desire for this kind of device and I'd love to contribute something to the beautiful LGPT community out there.

Cheers