Something that just occurred to me:
We all know how Allomancy can compound a Feruchemical attribute. When you burn the charged metal, the power coming in is converted into whatever was stored in the metalmind, instead of releasing the Allomantic charge.
I was wondering whether this would work the same with Hemalurgy. For example, if Vin had swallowed and burned her earring for some reason, would she have temporarily gained her sister's Bronze power, ten times multiplied?
Logically, it ought to be possible. The theory (Allomantic power altered by a pre-existing charge) is the same.