Hey, thanks for posting about vu+ app on tvOS! This is brilliant I never encountered that in my search.
Although I'm unemployed dev (I know how it sounds) supposedly to have lot of free time, it's not easy task for single man to develop something great in short time.
I tried to contact few distributors in Poland to get some tuners for testing but no response, and cost of them can be huge (altough I found Zgemma Combo for 420PLN and thinking about it). I'm saying that because I wanted to create IPTV client that could rival TVMate on Android and also could cooperate with Channels DVR engine.
As for Channels it supports various sources that STREAMS. Difference is Channels is a software while Enigma tuner is a hardware that has own CPU, board, socket and contains own low level apps to interact with access modules, CI/CI+ transmission etc. And because such tuners can convert signal to stream CHannels could support them that way if they write proper algorithms to at least discover tuner over the network, a bit challenging but definitely worth pursuing Such tuners can decrypt encrypted DVB-C channels as well so you can have later your recordings on disk decoded and stream without problems.
For satelite sources as Freesat it is difficult to receive in Poland,in my city it probably requires 120cm dish as these are broadcasted in british beam. Two polish crap satelite platforms utilises Hot Bird 13E, and if someone is capable of doing two-sat installation it rathers choose Astra 19.2E instread of british Astra Not to mention challenges with creating satelite access network inside blocks with many apartments.