I think any old 5-speed BSC (British thread) freewheel will fit on the Viscount hubs. Basically any 5-speed that isn't French threaded should work fine. I could give you one for shipping costs if you can't find one locally.

I recently saw some titanium spindles that should fit the standard 6003 bearings on ebay. They were titanium and $30+shipping IIRC.

I have an old Viscount that I was thinking of turning into a single speed. If anyone wants an original BB/crank combo and can help offset the costs of the replacement parts, PM me and maybe we can work something out.