I hadn’t thought of using a USB Ota tuner! What a splendid idea 
Does live TV work just like it would from a TV tuner? Channels up or down, via numbers, or possibly even pulling up a TV guide! - all via CEC on the osmc box?
Edit - Google Foo answers: Feedback on using OSMC: tuner, Program recording, antenna - #37 by Slartibartfast
Really lovely - this opens up a bunch of other options