aruckle Does iMazing require the app to be a purchased with license to create the IPA file version?
I have no idea. I have licensed iMazing for over a year now. I still use iTunes to do very simple things like copying Kindle and eBooks from the Mac to the iPads, but for anything else, iMazing is a much better tool.
To get the IPA, I simply launched iMazing, then plugged in the iPad (to Mac's USB port). Then select the mounted iPad in iMazing, and navigated to the ASIAIR app. Then downloaded the ASIAIR app into iMazing -- at that point, I could save the IPA file to the Mac's Desktop.
I think you can only save the IPA of the current ASIAIR released software. It does not appear to be possible to fetch the IPA of the ASIAIR version that is on the iPad. I.e., if ASIAIR at the app store is at v1.5.1, and the iPad is still running v1.5, it appears that you can only save the IPA of v1.5.1.
I have not yet tried to see if it is possible to get TestFlight betas of ASIAIR. TestFlight does not appear on the M1 App Store, but it may just be possible to get an IPA of TestFlight by using iMazing. However, whether you can then use TestFlight to fetch the beta is a different story. It might be, I just have not tried it.
An iPad works perfectly for me (my 12.9" iPad Pro has pretty much the screen size of the 13" MacBook Pro :-) and I take the oldest and lightest iPad Pro (9.7") out to do Polar Alignment. I suspect an iPad Air is even better for Polar Alignment, but I don't have one of those, and my iPod Touch screen is too darn small to squint at for Polar Alignment.
The file with the .iMazingapp suffix may just be some archive of the user preferences -- most people will only need to archive that. For the IPA file, there should be something in one of the menus that says "Export IPA" or something like that (if memory serves, it is in the same menu right under "Import IPA"). A proper IPA file has the .ipa suffix.
I have not found the lack of touch interface to be limiting when using ASIAIR on a computer screen. The GUI is very unlike when you VNC to an iPad from a desktop computer. The VNC mouse clicks are totally unnatural when it is linked to an iPad. But ASIAIR feels completely natural when using mouse clicks.
By the way, by allowing ASIAIR to use macOS Location Services, the Latitude and Longitude fields in ASIAIR are correctly filled in.