Available as an assembled Module and as a DIY project.
This Module is currently available.
Passive MIDI breakout on 3.5mm TRS sockets
The Tiny MIDI breakout provides 3.5mm TRS MIDI connectors for compatible modules with breakout headers - the disting mk4, disting EX, ES-9, General CV, and FH-2.
It can also be used with modules from other manufacturers e.g. the Michigan Synth Works F8R.
The six sockets can be shared amongst modules as needed. The module is entirely passive, and can be wired up for Type A or Type B 3.5mm MIDI.
https://www.thonk.co.uk/shop/expert-sleepers-tiny-midi-breakout/
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These merchants probably sell this module. Huh?