If Santa Cruz is using Tuscon as platform; it won't use HTRAC.
Tuscon uses a transverse engine; while HTRAC requires a longitudinal engine platform.
Tuscon's AWD uses electric clutches to engage the rear axle. But as the Tuscon doesn't have a limited slip front differential, it relies on traction of the left front wheel to send power to the rear wheels. ('Traction' can be artificially simulated by use of brakes on wheel that is spinning - Cadillac does that in SRX, etc - not 4wd, but if done well, close enough for practical purposes - just a little harder on brake pads).
Give me a pair of electric lockers and now we're talking. Then you could be spinning all 4 wheels.
You aren't physically moving anything in transmission (solenoids and electric motors do all the work), so a lever just requires more cost (so you can't damage it if you try to force it beyond limits) as you are just toggling a switch.
Only in a Jeep Wrangler is driver actually activating 4wd these days...