this is the pickled green peach recipe I intend to try.
Umeshi plum wine is easy 50/50 fruit and rock sugar cover with strong Soju, sochu or saki(boost the proof with Vodka or everclear if necessary) .
https://www.thekitchn.com/how-to-make-umeshu-japanese-pl-118396
You are what you eat and all those PC larva have ever eaten is plum so I would use them too. pricking the plums will infuse them faster serves them right.