David,
Jim Hamm said it could be done in TBBI. I can claim no credit. Although I tried it and found Torges' HOB method more efficient for my body type. Jim's a really big guy and maybe that helps. I do blend the methods after chasing the ring above the desired ring and pull into the waste as Hamm recommends v. pulling into the desired ring as Torges prescribes.
Here's some info on chasing a ring:
Roughing Out a Selfbow - Page 2