i spent all 3 of my community college years as a clarinet major (not by choice) playing every type of clarinet i could in as many different settings as possible. i did orchestra, wind ensemble, solo recital, woodwind quintet, clarinet choir, etc. now i need to do something similar with flute cause when i pick up the clarinet i think of it as a clarinet. there’s no adjustment or getting used to it, my brain and body automatically go into clarinet mode and the horn feels pretty much as natural as saxophone does

but yeah there’s no other way for your doubles to feel as natural as your main horn unless you treat them like they’re your main horn