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If this is implemented, the most likely mechanism would be to add a LIKEPR keyword as suggested in the comments, and possibly also a TEMPLATE keyword as suggested in the description.
The issue is that the Procedure interface on the callback can't use the prototype because a procedure can't be defined for a prototype when ExtProc is being used. The actual message is RNF1505 A procedure cannot be defined when the prototype specifies EXTPROC(variable) or EXTPGM. Maybe the real fix is to allow a procedure to be defined when the prototype specifies ExtProc(variable).
This could be done without creating a template, by simply allowing me to define a procedure with LikePR which would allow me to include ExtProc() with a reference to a procedure pointer. On the procedure interface side of things, I could define that LikePR and not have to define the parameters a second time.