Are there any decent sealed 126 or 130 spaced rear freewheel hubs that I'll be able to run 7 speed on, that would be suitable for long heavy miles (lots and lots of miles...) and not cost a fortune?
It's the "not cost a fortune" that scuppers you. DiaCompe's retro ENE line includes hubs, £65 r and £60 f, which will presumably be similar quality to the Gran Compe track hubs, but as you'll doubtless have dismissed Phil at just over £160 for a pair, £125 for a pair of hubs might be approaching your idea of costing a fortune.
It's the "not cost a fortune" that scuppers you. DiaCompe's retro ENE line includes hubs, £65 r and £60 f, which will presumably be similar quality to the Gran Compe track hubs, but as you'll doubtless have dismissed Phil at just over £160 for a pair, £125 for a pair of hubs might be approaching your idea of costing a fortune.