Transmogrification of Heirlooms will work.
From Blizzard:
Transmogrification of Heirlooms
I'd like to provide an update on this statement I made. It turns out that Heirlooms will be eligible targets for Transmogrification. Also (and this applies to all Transmogrified items), trading, mailing, auctioning or depositing an item in a guild bank will remove the Transmogrified art, returning the item in question to its original artwork. So, while you won't have to stare at the same old Heirlooms the whole time you're leveling, you won't be able to send a set of Heirlooms that have been Transmogrified with tier 13 art to your level 10 alt.
From Blizzard:
Transmogrification of Heirlooms
I'd like to provide an update on this statement I made. It turns out that Heirlooms will be eligible targets for Transmogrification. Also (and this applies to all Transmogrified items), trading, mailing, auctioning or depositing an item in a guild bank will remove the Transmogrified art, returning the item in question to its original artwork. So, while you won't have to stare at the same old Heirlooms the whole time you're leveling, you won't be able to send a set of Heirlooms that have been Transmogrified with tier 13 art to your level 10 alt.
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