IIRC, one of the original concepts of a club class was that it could be defined by any limited handicap range. It seems to have morphed, at the FAI level, into a strict, these 10 models only class.

Depending on contest size, instead of one sports class encompassing 1-26 to Arcus and trying to apply handicaps, why not split it into 2 or 3 club classes of defined handicap range? Of course, you need to maintain a minimum class size to have a reasonable competition. Set ranges like Club A .80-.89 Club B .90-.99, Club C 1.00- 1.10 and keep the gliders close in performance in each class.

Class ranges likely need to be finalized the day of the contest once all gliders in the contest are known.