perhaps the befaco instrument interface?
not seen any diy modules like batumi to be honest
maybe this: https://pushermanproductions.com/product/void-modular-dual-adsr-12hp-pcb-black-gold-aluminium-panel/ for the adsr???
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities