This morning I accomplished this VERY easily. Since the other I had tested remote access using Telnet to a local comm port and was able to use the same commands ("DCU-1" style) from a telnet session 1000 miles away, I figured this would work just as well. And it does :-)
What I used was Eltima's software "Virtual Serial Port" and I created a pair of linked Virtual Comm ports.
Since DXView can only go up to COM16, and since COM1-15 on my system are already all in use, I used COM16 for the DXView side, and COM40 for the YoctoAzEL side.
Above shows DXView's window, note the Antenna presets which are clickable to turn a connected rotor.
And because DXView is setup and connected to the virt comm port now when I right-click a call that was spotted I can then select "Rotate short path heading for <callsign>" and my antenna will now turn to that heading.