Well, after years of trying to figure out something I thought I would share what I did. I'm super happy with the functionality, about 50/50 on the "look" but as I didn't modify the door, I have a chance to rethink the "adapter." For those of you who care, here's what I did.
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Original sliding door. Builder door. Vertical blinds. Internal latch with no way to enter the door from the outside. That's what we wanted though, a way to go in/out of the door without having to run to the front of the house, go in, go to the basement and unlock the door.
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Brute force. Replace door with a new door that had a lock and thumb screw that could be automated. Meanwhile, much better insulation, operation and "lites" for aesthetics.
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The new lock/handle. The trick is that all the add one deadbolt turners such as August and Switch-bot need room to mount and there's not enough room. The handle part is in the way.
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The handle is removable.
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First fitting of a PVC board that will allow me to move the handle out of the way, and give me a place to mount a Switch-bot lock so it can lock/unlock the door remotely.
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Works perfectly. Looks are meh. I wanted to make it narrower, but need every bit of the width to mount the lock. Below the deadbolt not possible as it's too narrow. So 90 degree angle it is.
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Finished assembly. Everything works. There's a keypad outside with fingerprint reader. So I can unlock the door from outside with a code/fingerprint/Siri (Apple Watch) or Switch-bot app etc. So, finally we can be outside and get in and out without a key or running through the front door.
Anyway, it works. And with it integrated through @tomw excellent driver I can also do things like make sure the lock is locked when we leave, warn if the door is ajar when we leave etc.
It's a way. A brute force way to be sure.
Additional notes: Door is an "MP Doors 72 in. x 80 in. Smooth White Left-Hand Composite Sliding Patio Door with 15-Lite GBG" from Home Depot. The curtains are also automated with a Switch-bot Curtain 3 motor. Also, after looking at these pictures, I'll probably cut the bottom 4 inches off the adapter. I made it long for symmetry, but I think that's a mistake.
