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I'd love to do something like that but one of the frames needs a decent gear range for Deliveroo duties (which admittedly I haven't done for weeks). The Marin has semi-horizontal dropouts but they're too short for chain tension unless I do magic gearing and half links or whatever, so that one needs a derailleur basically.
The coaster hub I've bought is a Shimano CB-E110 (I think) which is single speed. It solves my 27" woes but prevents the use of gearing. The drum brake hub would be great on the 27" frame as again I don't need to piss about with finding appropriate rim brakes, but that bike has no braze-ons, no hanger, no bottle cage mounts, etc. so it's really senseless to have a dynamo on it. Maybe I can find another drum brake hub and build that into a front wheel for the 27" bike.
BTW I wanted gears for the old Specialized Hardrock frame I got hold of, but decided that 3 were enough so built a Sturmey Archer 3spd hub into the back wheel, came to £20 with the cable, toggle chain and a used trigger shifter and works perfectly. Had to cold set the rear end to 120mm.