Re Sky, double check if you can leave their hardware in place, then use your new router to serve your house internally (so fibre optic cable to Sky box, network cable from Sky box to new router, all network cables for rest of house plugged into new router). You might need to set the Sky hardware's IP address as the gateway in your newer router's config, and probably disable DHCP on the Sky one for LAN. Or consider splitting the DHCP pool between them if you can't disable.
Regarding passwords/donations for Simple IPTV client, you can definitely use it for some purposes without a donation, as there is an Israel (live? sport?) add-on that uses it, and vdubt25 use to have a playlist to use with it.
I've retitled this thread and put it in the Kodi area of the forum, in the hope it might get more visits from other DroidBOX members who have experience with using TV tuners.