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What I am wondering is whether the part of a 120mm track hub where the fixed gear cog threads on is the same as a 120mm hub intended to be used with a 5-speed freewheel
Get a track hub designated as 'flip-flop' of 'fixed/free', they have a freewheel thread on one side which is the correct length to take a multiple freewheel. You will have to move the hub sideways to get a multiple freewheel to clear the driveside dropout. How you do that depends on which hub you buy.
Alternatively, Bitex have partially filled the hole left by the apparent demise of the SunXCD hubs with a 120mm cassette hub RAR8
https://bitexhubs.co.uk/product/rar8-120mm-road-hub-rear/28H only, and super dished to squeeze an 11s rotor into 120mm, but you do avoid the long bearing overhang and corresponding axle breakage inherent in a multiple-freewheel design
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gbj_tester
I am rebuilding a bike using an 80s French frame with 120mm rear spacing. The wheels are knackered and need to be replaced . For the rear wheel I would like to use an old-school 5-speed freewheel. In terms of rear hub choice, can I just use a 120mm track hub? What I am wondering is whether the part of a 120mm track hub where the fixed gear cog threads on is the same as a 120mm hub intended to be used with a 5-speed freewheel. My suspicion is a modern track hub will not be suitable as there will not be enough room for the freewheel.