we are married but I am not sure which is the best option
You can't get a PMV, as you are already married.I understand, yeah she would be applying for a tourist visa but once if she applies for a PMV wouldn't she go on a bridging visa. The only drawback to that is she wouldn't have working rights till she gets the PMV.
I may be totally wrong here
Getting a tourist visa without a "No further stay" might be the big problem.
If you can, then the 820 Partner visa route is a good one. Otherwise the offshore partner visa 309.