Internal hub 3 speed?

[Grant-53]

My 1967 Huffy has a Strumey Archer 3 spd hub and I successfully replaced some of the cracked gears with parts from another unit. The older books call for 30w non-detergent oil lubrication. White grease won't hurt them but the oil works better. Cable tension is critical too. I switched from stock 48/19T to 40/19T for stop and go city riding. The common S_A models were AW-1 and SW-1. I doubt you would need to take the spokes off unless they are damaged. Another bike I put together is a ladies' Huffy frame, 26" rear wheel with a Shimano 3spd coaster brake unit and a 20" plastic front wheel...very comfortable and responsive. Cogs from a derailleur cluster can be cut inside to fit an internal gear hub so that two gears can be mounted together. A derailleur can be fitted to shift between them for a six speed rear end. The rear gears should be 3 teeth apart and the front rings should be 4 teeth different. Example: 16/13T rear and 44/40T front.
The new 10 spd Shimano hub with disc brakes is something I'd like to try for an aero bike.