@John ******
lots of assumptions there that I would regard highly ambitious.
Let's first consider that to date, IOs are generally less keen on letting you in once you go beyond the 6 month mark in a 12 month period on tourism-purposed visas or alternatives. There's no sign this soft limit changes with the new measures, so a fair assumption would be that you'd be let in twice to max out 90 days, and you could try to push your luck for more, but no guarantees. And that is not dependent on whether you enter by land or air.
All irrelevant in this case because the TS is staying far below 6 months. She's good with it without new norms.