Originally Posted by
gfk_velo
It depends on what you are prepared to spend.
Because BB height in a trike can be whatever you need it to be, and front wheel / foot overlap is not a massive problem, almost any length of seat tube / reach to the handlebars can be accommodated. It's better if front wheel overlap can be avoided, of course ... but not the close-to-necessity it is on a bicycle.
At Longstaff, we / they have built trikes with full-sized wheels with incredibly low BB step-over heights / saddle heights for riders with specific disability - it's not a low-cost thing to do - but nor is it the close-to impossibility it is on a bicycle.
As mentioned above, you kind of have to forget bicycles in trike-world. It's a bit of an adjustment to make!
I have looked at your bikes before, and if we were on the same side of the world might well have reached out either directly or through my LBS, but my budget makes your trikes a dream, and getting it to the states doesn't help that...