Hello,Dear. I have read your proposal in detail and understand what you want.
I have developed already IPTV system(admin panel, API, and Player app) that consists of 15 servers using Xtream code and I am managing the VPSs, admin panel and reseller panel.
I have implemented the system comfortable with mag box, enigma and several devices.
Of course, I have good experience in ffmeg and HLS.
So I can help you will satisfy your requirements well.
If you want, I can start your project right away.
Best regards.