You can easily stretch out the rear. I did it on mine. Its amazing how much steel will take. A length if threaded rod with 2 large washers and nuts. Gently wind out the rear end. Keep releasing and checking measurement. Avoid stressing the gear hanger and finally check wheel alignment.Amendment to my ramble above haha
I tried a spare 130mm rear wheel on the Thame frame and it is a very tight fit.
So it will be 126mm axle with 7 speed freewheel.
Chorus, C Record and Croce D'Aune there maybe more.
Croce Brakes are a kings ransom though.
Onward
Reiver