[Eddie Grice]

Muriel at SCD may have some of the late Chas Keelings chassis jigs left. Scroll down following page to find it. Prices possibly out of date.
http://www.chaskeelingscd.co.uk/tools.htm
No jig wheels with this but Betta & Classic used to do blanks for their sponge tyre truer which would do the job. Can't now see these on their website but an email to Ian Fitzpatrick with the diameters you require may be worthwhile.
Eddie