It's not obvious to me that for a given elevator position, rolling
to keep the nose level would affect the likelihood of a stall.

Agreed. The elevator position determines the AOA. Banking the
airplane keeps more or less the same AOA, but the associated speed
will increase.

If the a/c didn't stall in the bank, then it likely wasn't going to
stall in straight flight, particuarly with only 1/3 "up" and a forward
CG.