It has been done in one form or another, mtdew built a nice krink from a mixture of parts, do a search under "krink of sorts". The parts are out there, try http://tantal.kalashnikov.guns.ru/ or a guy on gunbroker named ruseller.
www.k-var.com should have the front sight gasblock you need or you can cut the front sight off and TIG weld it to your gasblock. Keep searching, ask questions and maybe put an ad in the WANT AD section. Tony