Because the Modolo Morphos brifters have different settings for cable pull (5 to 9 speed campy and shimano), I wonder if they might be useful setting up a bike with drop bars and an internal hub.

Maybe not something like an 8-speed hub, but at least a 3-speed hub? Is it true that '3-speed hubs don't need super-accurate shifting as long as 2nd gear is correctly adjusted'? In that case, anything that moves the cable in each direction might do the trick.

Has anyone had any experiences with something like this?

I have a set of Morphoses. They are pretty annoying with derailleurs, so I'm tempted to experiment with them.

Don't over think this.

On a three speed hub, one must align second gear. The other two gears are found a cable slack and cable taut.

Align second gear with any poly speed RH brifter, indexed barcon or indexed DT lever in a known and repeatable middle index position and pretty much Bob's your uncle.

(Now obsolete) SRAM/Sachs T3 hubs work well when shifted with Shimano LH triple brifters.

There is an aftermarket brifter for the Shimano 8-spd IGHs.

A quibble. While I agree that the three speed positions are very forgiving, the term cable taut might cause problems. The cable pulls on a sliding clutch that turns with the sprocket and rides on a plain (not ball) bearing . It's designed to operate only at the load generated by the clutch return spring. Low gear is properly located with the clutch pulled all the way to the right (out) but the cable shouldn't actually be any tighter than that. If the cable is pulled to where it's under tension, that increases the load on the clutch bearing causing excess drag and wear.

So the correct 1st gear position is better described as just short of all the way to the right and not quite taut.

stuck friction DT shift levers on my AW3.. in 1962 .. the 3 cubed 27 speed.

Cool. I'll let you know how it goes!

Maybe a coil spring, in the shift cable routing, will be strong enough to hold it in low gear,
but give enough if there is a mismatch..

the safety limiter in the front V brake noodle on the consumer
Hybrid bikes like Trek Navigators, is somewhat along that line..

you pull the cable, the housing compresses a spring first, to slow down
and towards the end of the lever travel it pulls like it would if not for the spring being there.

Helps to keep from sending a casual rider over the bars ..

A quibble. Sturmey-Archer is not the only IGH manufacturer, and many three speed hubs have 3rd gear at cable taut, not first.