I am not 100% certain, but I believe the enhancements are only account bound, not character bound. Thus you should be able to email them to your other character(s) that meet the minimum level requirement for the set. I'll muck around with them on Beta and/or Test and see what I find.
UPDATE:
On the Beta server, I was able to slot the store bought Obliteration set, unslot it, then email it to myself via Global Email and slot it on another character.