I'm in serious danger of overthinking this! Wish we didn't have to wait a whole season to try something new, and another whole season to see how it worked.
Steve - I don't know any of the varieties you mention but I do grow Latah which fits the determinate, short, early and open pollinated categories. I"m thinking of building my new strategy around Latah and similars.
Imafan - I've been reading a little about dwarf 'tomati'(a word I invented by mistyping and decided to keep). Seed buying and shipping to Canada (also seed saving - are they all hybrids?) might be problematic. Your comment about heat intolerance is appropriate here & now! That Johnny's web page looks useful - haven't perused it yet. I think I've stopped shrinking; more like shrivelling now.
Paul - I'm able to deal with most stoop & bend problems by being careful and using physical lifting/moving devices- some with wheels; but I'm more distressed by reaching, esp. overhead. I"ll put in a plug here for our most recent wheelbarrow, made by 'Gardener's Choice.' It's light in weight, with 2 wheels positioned so that it's balanced in both directions. I can move it around with one hand. But "No backaches involved"? those days are long gone

. Waist high beds would be great but I'm past building things and probably wouldn't pay what someone else would charge.
Applestar - (I'll respond separately to your message) - As always you've provided much useful info and food (!) for thought. I've already been pondering the 'top the leader and grow the secondaries' approach. Any system that involves hanging strings I'll 'deprecate' because it means a superstructure to build, maintain, and work with.
Pepperhead - Succession planting short DTM types is another strategy I'll consider - thanks.
Signing out - Sorry, my new "improved" hi-tech phone line is having a hissy-fit. A pox on so-called progress.