My feedback is never start a thread that points to players as jerks, it will not do well
but Posting my own idea since it shares similarities with yours
to this I would add.
When queueing, there could be a checkbox similar to the “willing to lead” but it would be “transmog run”
You can only earn transmog currency while on a transmog run
You can only receive appearance, not actual item while on transmog run
if you don’t use this option, but outgear the content you will have a severely restricted dice roll (exceptions on certain items that somehow end up being better even at lower ilvls than other items at higher ilvls)
Can only use transmog currency while on a transmog run (no double dipping, for metrics)
Transmog run isn’t competitive like PVE loot you can freely spend currency on items that “drop” as long as you have enough, meaning multiple people can get it.
(this is to encourage mog hunters to do transmog runs instead of putting themselves in competition with PVE characters attempting to upgrade.