Hmmm. Probably. It has been forty years, and I had the camera for just a couple months (traded it back to the pawn shop for the Spotmatic SP that I still have).
A bit off-topic now, but the Kodak Instamatic Reflex was a Retina Reflex with the chassis altered to fit the 126 cartridge, and an externally-mounted automatic exposure meter. And a flashcube socket! It used the lenses from the RR, and was an expensive failure in the market.
Since a roll of 828 Tri-X costs $20 now, I don't think I'll shoot any in that pretty little Bantam RF. But I'm happy that I could, if I wanted.
However, a roll of .EDU Ultra 400 in 120 is only about $9 last I looked (that's been a couple months, I could be in for a shock soon) -- that, a razor knife, a pair of scissors, and two 828 spools, plus a dark work space, will get you a 16- or 18-exposure roll. I've done it, and it works well. Even actual Tri-X in 120 is only around $14, last I looked (potentially two Kodak price hikes ago, however).