The Pro II adapters won't fit. The Bulb QR axle goes right the way through the hub and screws together in the middle. I'd try UK Bike Store because they seem pretty good for older spares.
Personally, I'd try and source a pair of older Bombers with a QR axle of which there are normally a fair few about. I'd also go for 130mm rather than 100mm. Slap on a dual ring and some lighter tyres and you'll be able to do some more grown up riding.
2015 Stanton Ti Switchback
2006 Specialized Demo 8
2013 Specialized Allez Sport
1999 Santa Cruz Chameleon
1994 Cannnondale Beast of the East (rebuild still in progress)