I have some spare vacuum pipe - I'd happily send you a piece and a peg to sort out the deficit. Had you done the solenoid branch blocking too?
http://www.landyzone.co.uk/lz/attachments/f9/20100d1291907511-egr-blanking-mod-yooiu.jpg
PM me if you like :)
Dunno about the corrugated pipe, pics?