The H4 bulb was probably designed as a conversion bulb for the 6052/H6054 sealed beam - so that's no trouble.
I would suggest getting Hella housings from Susquehanna Motorsports - $40 a side with bulbs, and they're class housings (I believe the E-codes or the DoT-approved Vision Plus housings will cost the same.) Just don't bother with those "diamond cut" jobs you find on eBay for ten bucks a side - they're not worth the money.
If you can find something in the JY that will work for you, go ahead! As noted, the 200m/m-6052-H6054 is a fairly common lamp size, so it's just finding a pair of conversion housings in the JY that aren't in too bad shape to use. You can't really get into them to polish them, so rehabilitating the bowls will be difficult.
Hella, IPF, Cibie, and even the Autopals are all decent or better (I tend to prefer Hella, unless I need some serious lighting. Hella is an excellent compromise between performance and price, I think.)