Rob,
I tried hard to test is ASAP. It's a very preliminary bunch of tests, so take them with a grain of salt.
Bad new first: EQ MOD still does not work if launched directly from the EKOS UI. However....
Good news: I tried launching indiserver from the CLI (browsing through kstars.app/Contents/MacOS/indi) with:
./indiserver -vv ./indi_eqmod_telescope ./indi_canon_ccd ./indi_skysafari ./indi_qhy_ccd
and it worked! I tested the EQMod driver through a Bluetooth-to-serial adapter connected to my Orion Atlas, together with my Canon EOS 7D Mark II. I also connected SkySafari and it worked very smoothly. I tried slewing to a dozen targets, took sample pictures, used SkySafari for GOTO's and everything worked.
On the wings of enthusiasm, I also tried to connect my Orion SSAG through the QHY CCD driver, but it didn't work. I previously tested the SSAG with CloudMakers indiserver and it worked. Apparently, it uses the Indi_qhy_ccd driver, but I'm not really confident about that, maybe I misinterpreted its drivers.xml file.
To me this is a great step forward. I'll test it on the field this weekend, if weather forecasts are right.
P.S. Just in case you need them, I'm attaching the logs. It seems that Indi_eqmod crashes immediately after it finds the mout is parked.