Using TK and other imperial armour parts is allowed as long as you don't use to much, rule of thumb is about 80% has to be mando.
If I remember correctly, snowtrooper gauntlets aren't a full wrap around, the CRLs do say the following
Full or half/bracer style hard shell gauntlets.
Heavy leather bracers which wrap at least 3/4 of the way around the forearm.
Laces are HIGHLY discouraged as a method to secure these types of bracers.
Preferred methods would be belting or buckles.
Materials such as vinyl, pleather, and thin leather or suede will NOT be acceptable as a use for forearm covering. Pleathers or vinyl COULD be made into strips for wraps but are unacceptable as bracers.
Ren Fair bracers, Unmodified-Leather bracers, Reenactment bracers are no longer acceptable; and if an individual wishes to become a beast master than the leather gauntlet will be permitted but only after being approved.
Wraps will no longer be permitted to replace gauntlets unless used specifically for the “Montross” Mandalorian character, future canon characters with wraps for gauntlets, or Early Crusader armor kits.
Which I think means they're OK, but I'm not certain so it wouldn't hurt checking with the appteam.
With that being said I think you could make an awesome pair of gauntlets from them, you could even use the damage on the one to your advantage.
Rough it up a bit more and paint it up like battledamage.
As a suggestion, a snap on the sleeve like shown below would keep them from flopping around on your arm when walking.
Also Sabine's gauntlet can be a good source of inspiration for additions to them I think, they seem to have the same general shape with bottom half being shorter than the top.
