you probably know there is sort of a family relationship right?
1500 Midget has a gearbox adapted from a Morris Marina
George Turnball, when he finished as Managing Director of the Austin Morris branch of British Leyland was given two Marina's - which he promptly took to Korea and reverse engineered the Hyundai Pony.
https://en.wikipedia.org/wiki/George_Turnbull_(autoindustry_executive)
I don't think they had the Pony in the USA - appalling cars - quality comparible to a Marina and biodegradable, but, I'm still trying to figure out if a Pony 5 speed would mate to a 1500. Unfortunately the transmissions are about as rare as 210's though MUCH cheaper if you find one.