Just love the technology.
The only problem with drones. You need a PfCO to make money with them. That can be another £1000
Don't forget to fathom in the cost for going commercial. In the UK it's £1,000 Permissions for Commercial Operations
I would go with either of these two. https://youtu.be/Ojt4eCC9B8E
Just fix it in post.
Next time hack your Canon with the Magic Lantern hack. There is a setting in there that will give you a clean HDMI output.
I seem to remember a guy who swore by an "I rig pre" with his Tascam.