I have used these folding adapters before with good results. They cost $16. Just use a brace that mounts on a buffer tube.
https://www.ebay.com/itm/7-62x39-Side-Folding-Stock-Rear-Bracket-Adaptor-Aluminium-Alloy-Foldable/192654664802?hash=item2cdb1ce462:g:l9EAAOSwHOZcDiR6
Hope this helps!