Yes, it's possible. It's not going to be a classic RNY bypass but the anastomosis will be changed to an RNY one anyway.
I think I'm going to get this along with hiatoplastic and gastropexia (hernia is back again and with it reflux got worse). I'm still on the fence though because at the moment things seem to be better again.
ETA: fixing bile reflux after MGB is obviously quite like fixing bile reflux after partial gastrectomy with a Bilroth II anastomosis. They change the anastomosis into an RNY one.