Hi Chris, I've seen your request on User_talk:Jburgess. I fear you won't get an answer as I didn't. My question was on the 17th of April. I guess you did put your request there following the recommendation I followed...
Then I found a mitigation:
I wrote it in Tile_usage_policy, but my modification was reverted.
May be an idea for your case. See the discussion in User_talk:Harry_Wood#Tile_usage_policy_revert
(feel free to delete this page ;-))