MattCB and Holli4pirating - Thanks for your input on this.
Decided to put this one aside to work out the problem some other day. Going to do some more reading up on these things and ask some of our restorers about the best way to proceed with this job. Whatever happens it will be a really unusual, and maybe even an ugly razor. Best case I could have a full length razor with a shorter blade. The fact the blade is 6/8"wide could make it look a bit weird. Worst case I will have a razor shaped parcel/box/letter opener.