My suggestion: Attempt to do it.
It’s not easy. Mouser is especially difficult sometimes, its search facility sometimes gives you great power to zoom in on what you need and frequently just sends you down dead ends. Digi-Key similarly, though sometimes does better and sometimes worse. Tayda generally has lower prices so I usually start there. The search there is primitive and easy, type a part number or keyword in and if it finds it, it finds it. Sometimes Google with “site:tayda.com” is helpful. Tayda doesn’t have Mouser’s and Digi-Key’s selection, though; sometimes you need to split orders to get everything you need (and then you spend more in postage but you may make it up in prices).
Compare against the Rapid listings you already have links for to narrow down possibilities. Look at datasheets; they tend to be very confusing at first but eventually you’ll find they’re very confusing, but most of the answers are in there somewhere. I save them on my computer to refer to later again and again.
The switches (one of them in particular) for that module evidently are troublesome, there’s discussion of that at the beginning of this topic: 1157 MINI ADSR Module
Then post your list here and we’ll take a look. I’m sure we’ll find some things that need changing. But by the time you get to the bottom of the list you’ll have learned a lot about sourcing parts.