I am trying to transition to Indi from Windows and Polemaster is on my critical path...
I have to say the QHY software is great - it takes you step-by-step through capture/solve/adjust sequence so a Linux version would be very welcome. (Its all done in 5 minutes max )
On the comments about FOV - yes, the FOV is big on the dedicated QHY polemaster cams, but having this routine available for people with these cams would be a huge first step..
In any case, I often do a quick-and-dirty adjustment first using the polarscope and one of those NCP location apps. I think this should get polaris in the FOV for most finder scopes. I take the point that solving may require a large FOV. However, if sharpcap are advertising it I presume it can be made to work for sufficiently small finderscopes - indeed on their site it says "A field of view in the camera of between 1 degree and about 2.5 degrees". I reckon a lodestar on a William optics 200mm finderscope has an FOV just short of 2deg.
You should be able to use it with the Polar Alignment Assistant tool found in the align module in it's stock configuration.
I have accomplished something very similar with an ASI 120 with a 50mm lense (same FL as polemaster) mounter on the RA axis.
INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
Waveshare Stepper Motor Board - DIY Focuser
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.