Update: surprisingly got through to the CRA... lots of "maybe" answers and "not sure," but they outlined some "options" #facepalm
- definitely no to filing a second provincial S11
- me + spouse can file in BC still
- I can file on ON, she can file in BC
- can try claiming provincial amount from previous year's return on next tax return in BC (i.e., leave it blank on ON S11 form this year, then next year's S11 BC transpose the provincial number from last year's notice of assessment)
Really seems uncertain if BC will honour the credits from before if moving away and back, and no clear way to log them. Seems like an audit-trap.