I'd go for a full size clone if I were you.. much better ergonomics, plaits is small enough already, & you get full size knobs which are better for tuning etc...
maybe a Pams Pro would tick all your boxes, envelopes and synced modulation? as well as many other functions...
does the 03 sequencer output 1v/oct? idk...
take a look at my signature & spend some time thinking about it... especially the formula...
for utilities it's almost impossible to go wrong with a matrix mixer! and a quad cascading vca (veils clone for instance)
& you'll almost definitely want to improve your mixing from a 2hp mixer! thats much better
how are you mixing the rolland boutiques & the modules?
"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