I have a Regina 13-21 6 speed on my Raleigh Gram Sport (that was originally a 5 speed) and did not have any spacing issues.

I may be preaching to the choir but you did say "any help".

When you remove that Suntour use the QR or wheel nut to keep the FR2 tool on the freewheel as the 2 notch versions slip very easily and on an older hub that freewheel might be welded on pretty tight.

Putting the tool in a vise will also aid in removing it and once the freewheel releases you can back off the nut and will probably be able to finish removing it by hand.

A little lube / grease on the freewheel threads keeps them from seizing up.