That is very nice and as good use for a combo. Thanks for sharing.
I won’t be making on-board pots for those controls because there are too many noobs that would not understand what normal is resulting in a lot of support questions and the board would also need to then be twice the size it is now.
That said it is easy enough to hand wire two pots and locate them on the enclosure wherever you like.
I do appreciate the comment which shows there are good uses to have those on-board is great for anybody to try.