Is there a way to keep a stylistic set in sync with a certain language's locl feature?

Since I’m working with a very large amount of .locl glyphs that I often add and subtract from, I have to manually copy and paste the substitutions from the locl table to the stylistic set feature.

Is there any to have the stylistic set be kept in sync with a certain language’s locl substitutions through either opentype or or a script?

The locl feature defines lookups. You can reference those lookups in the stylistic set features.

So if you have this in locl:

lookup locl_latn_0 {
	script latn;
	language AZE;
	sub i by idotaccent;
	language CRT;
	sub i by idotaccent;
	language KAZ;
	sub i by idotaccent;
	language TAT;
	sub i by idotaccent;
	language TRK;
	sub i by idotaccent;
} locl_latn_0;

you can references it like this:

lookup locl_latn_0;

Thanks.