Convert old Campa hub to single-speed (chain line problem)
sorry, this is probably a singlespeed-newbie question but have not found an answer yet and thought I'll ask here before I bite the bullet and order a new rear wheel. I am in the process of converting my old 80s Ciocc Italian Road bike to singlespeed and have a problem with the rear wheel. It is a very old Campa hub for screw-on freewheels (not cassettes), so it's easy to screw on a single-speed freewheel. However, it has currently a 7-speed freewheel on it and the spokes are aligned accordingly.
So, if I screw a singlespeed freewheel on there that'll mess up my chain line, correct? Because the single cog will be roughly in the same position as before the largest cog of the freewheel, right? So in theory I would have to recenter the axle and wheel. I can't do that myself though and don't think it's worth to pay somebody to do it for such an old wheel.
So my question is is there any other option to get the single-speed freewheel into the right position to have an acceptable chain line? Some sort of adapter or anything like that. I've seen the singlespeed conversion kits for cassette hubs. Does anything like that exist for the type of hub I have?
Any advice will be much appreciated. Thanks!