I thought you were the same Amir. In that case, you know Harvey, who is one of the nicest and most generous guys I have ever known.

I know that the original SA S5 hubs have a narrow OLD and would work. With a 46t chainring and a 24t cog you can get it down to 33 gear inches in low and a top gear of 75 inches , which is pretty low gearing. Using a 22t cog you would have a low of 36 gear inches and a high of 82 gear inches.

Alternately, you could buy a modern SA 5-speed and reduce the spacing with thinner washers (actually the X-RF5 (W) can be acquired with a 119 OLD) and that would work. You will get a little more range out of the new hubs too...

When you say slide in and out unencumbered, what do you mean? An IGH is not going to be any more encumbered than a derailleur gear bike, though I noticed the bike has vertical dropouts and that would necessitate a tensioner, unfortunately. I do not think that will be any more an encumbrance than a derailleur at the rear wheel.