Congrats on your
Mini 3 purchase! I think you will love it! It opens up a lot of possibilities here in Canada due to its sub 250g weight. The rules are much less stringent and you can fly it in more places. Just a few hours ago I ran a timelapse with my
Mini 3 Pro of the sunset from the beach that is a few minutes from my house. Because we have had nice weather this past week (today it was around 25C) there were lots of people at the beach. I just picked a spot that was away from people near the edge of the beach that wouldn't bother anyone to launch. With my
Mavic 3 this would have been illegal since I couldn't have maintained the 30m horizontal rule and it is much bigger and louder.
I don't think you can use your
Mini 3 with your RC Pro (the
Mini 3 Pro is compatible) but you have your DJI RC you can use, so you should be good.
Not sure if you are aware, but the MSDK has been released for the
Mini 3 and
Mini 3 Pro and Dronelink has already released a beta version of their software. Litchi is apparently working on a version as well. I have installed and tested the Dronelink version on my RC Pro and have had some good results. I have been a user of Dronelink on my older drones for some time.
Chris