I can't remember how frequent it is, but surely that doesn't matter: just have the 61st sub-template transclude everything. In my opinion this whole idea is fairly rediculous anyway, though.
The 61st should just be a redirect to the 60th (or 60th to the 59th - does it go 0-59 or 1-60?). It does seem rather overly complicated. How would people know which template to add their AfD nom to?