Sounds like a valid reason for separate sets.
Questions: Would you set these up as completely separate releases or would the blue bats be a parallel to the puzzle-backs?
Because of collection info, were you planning on contacting all members who currently have these listed in their collections (be it collection, want list, or FS/FT list)?
If you decide to proceed, and need any assistance, just drop me a PM and I'll do what I can to help.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).