I've got a 'berg with a Rekluse and a Montesa 4RT.
I suggest you ride the little guy without an autoclutch for a while, then decide. Not being able to sit and paddle will take away much of the charm of an autoclutch, and the whole issue of rear freewheeling in undesireable situations will rear it's head, ugly or not.
I'll speculate that getting a Rekluse for that bike is unlikely. They don't do much with boutique brands, and the older the bike, the less likely. Somebody might be able to say whether a more modern kit "might" fit, but you'll be on your own. I went through that with an '09 Husky TE250, and chickened out. I got a deal on a 390 instead (the whole bike, not just the autoclutch
This guy will probably build one for you if you send in the basket, clutch parts, and a wallet full of dough.
Very cool bike, BTW.