Editing comma delimited cell in Google Sheets to replace some items

I have a cell that contains mixed input of one or more delimited items eg:

apple,ABC1,banana,BBC2,FGC3

I need to replace the items that contain ALPHA code eg ABC1 (from a finite list of about 25 codes)

with a new sequence (eg ABC1 becomes avocado,apricot,carrot, eg BBC2 becomes plum,damson,leek)

so that the new output looks like this

apple,avocado,apricot,carrot,banana,plum,damson,leek... etc

Can I do this with a formula?

I've tried switch and if but these only change the entire cell when a single item gets matched...

=SWITCH(Q2, "ABC1", "avocado,apricot,carrot","BBC2", "plum,damson,leek")

EDIT - thanks for feedback already, more info will be helpful here... This cell is in one column of about 400 rows, and I'm looking at creating a formula that can iterate through all rows. Also the number of delimited items in each cell varies (eg the next row might look like this: ABC1,banana)