Dan, thanks for providing me with these pointers. I’ll take a bit of time familiarizing myself with the info you’ve given me and will try to come up with something that will be useful for the Shotcut community.
I’ve worked in software development and support for over 40 years and know how frustrating it is to try and backstitch other people’s software into your own project, so sympathise with your efforts upgrading Qt. I also agree that HTTPS support is more important and have come a cropper several times with that.