I now have many weapons and armor sets that are not needed but were bought with badges and karma and so cannot be salvaged.
The only way is to use the extractor from the shop but its totally unviable as it stands at 300 gems for one extract it far cheaper to just rebuy the sigils rather than extract them. I would suggest making it 150gems and that each one has 6 charges to be used. So with each purchase you can extract sigils from one set of armor.
Or just allow the salvaging of karma and badge sets but only with a chance of receiving the sigil and nothing else.