Other options = silicone tubing, nylon washer, using SF props, switching prop brands, not losing the precious adapters [not crashing], modding APC or Hyperion or the new GWS adapter rings or these?], sticking with 7035 props
These Park 250 rings?
Here's another source of almost-the-right-size adapter rings, the FalconInserts.
And here is another, the GWS 3-blade prop inserts.
Alternatively, glue the stock ring adapter to the motor? Then maybe bevel the prop hole a little with an 8mm ball head burr? so it slips off more easily on impact?