Apple TV - DV Profile 7 workarounds

Hey all, I want to start off by thanking the team for developing the TvOS app - it’s awesome!

As a result I’ve invested into Apple TV & Infuse - only to find out (through my lack of research) that Profile 7 is not supported on device. I didn’t think this would be an issue initially but as it happens almost every 4k DV file I find via TB is remux (which I assume primarily come in p7).

The question I therefore have is how others are handling this

1. Is there a way to convert p7 to p8 or other on the fly?
2. I had better luck with webmux files although these have half the bitrate of remux, however finding these is quite tricky especially for older movies. Should I be looking at any other files or are webmux the best I can do?
3. Is there perhaps an easy way to filter out profile 7 when looking through various sources?

Thanks in advance