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Set it to 80 BPM and change the default 6/6 groove to C/C for the same effect. Or in general, double every digit in the grooves you are using. Tables will still run twice as fast (80 BPM) which you can solve by creating a new groove that you set to 2/2, and then activate by using the G command on the first row of the table. For example, if you use groove 1 as your "2/2" groove, put a G01 command in the table.

This will make the song work the same on both DMG and GBC.

A tribute/cover record Shpongle is what I had in mind, yeah. As chip as possible. Considering the style, I wouldn't mind some post processing, but preferably no plain fakechip. This might be a good opportunity for chips with some form of timbre control like OPL chips (FM) and C64 (analog filter) etc.

Yes, you can load programs into the A+B banks, or even replace Nanoloop. However, these can only be 32 kiB ROMs, (except for Nanoloop which is 64 kiB) since the cartridge uses a non-standard mapper which games/programs bigger than 32 kiB can't use.

The command description is described in the quick manual. (Press A when the cursor is over the command and look at text in the top row.)
Values 0-7 = absolute volume. Values 8-F are relative. And yes, even volume value zero won't make the volume go to complete silence. Try putting a note with the default instrument (the important part being, a non-changing volume envelope like A8). Then put a M77 command on the note to reset the volume. Then put MFF commands on the rest of the (empty) rows in that phrase. Or you could manually put the values from 7-0. Then play. This should give you an idea of the range the command has. This also differs between Gameboy models because the global attenuator (most likely) is an analog attenuator that is not perfect.

Right, the definition I'm using is being able to input the typical 31250 Hz UART current loop into the cartridge with minimal effort, as that would be one of the two things people would actually be interested in using for practical purposes. (The other one being MIDI over USB.) Additionally, even if you set up MIDI over V.22bis, I believe the Gameboy CPU would have to poll the cartridge periodically to see if a UART transfer had started, whereas the game link port can create an interrupt.

Having multiple ROMs on the SD card is sort of the point of the cartridge. LittleFM wouldn't support any special features of this cartridge, however I would still recommend using it (on any cartridge) for the faster and safer loading of songs, replacing that functionality of the built-in file manager. I could probably make special functionality for the Everdrive cart if I had access to one, but it would probably work and be easier to have multiple copies of the ROM on the SD card.

More plugging. In case you didn't know, LittleFM does support some multi-ROM functionality for EMS cartridges. LSDj+as many small ROMs as you can fit, as long as the other ROMs don't use SRAM. It takes some manual setup currently, though.

Please change DMG-LSDJ-USA to DMG-LSDJ-EU or even DMG-LSDJ-SWE.