This would allow your alts to have mounts (specifically event mounts) that are no longer available.

Things to exclude to keep it fair:
  • Any mount that would increase your speed. This includes any vendor bought mount that said increases your mount speed to 60%, 90%, 110%, 130%, and 150%. This would not include mounts that match your current highest mount speed.
  • Any mounts from non-event quests, notoriety mounts, PVP mounts, and artifact mounts.

I think this would be fair in terms of letting us use all the mounts we've bought, but still making us work to raise our mount speed.