Pretty sure you'll get interest as it's unusual, personally I'd ask for £200, if it sells then great, if it doesn't then reduce a £10 at a time until you find a seller.
Don't bother trying to weld/attach it, you'll always know it's goosed. do you have any othe AK's you could remove (carefully) and see if it'll fit or could be made to fit?
Well as I got an AK12 from peter207 I thought I should throw some more money his way & got some ratnik kit too. I'm pretty ignorant about Russian gear but I believe this is a 6W112 vest & pouches, with a clone helmet with RS goggles & cover.
I predict an evening playing with molle