You're right, extenders can be expensive, but they can save you a lot of trouble if you choose the right one. My go-to choice is Atlona, especially this one: https://atlona.com/product/at-ome-ex-wp-kit-lt/. The best part is that the destination end is powered by PoE, so you get active conversion all the time. We've used these very reliably (I would say they are industrial-grade) for the past 10 years.

We do have a few LCD controller boards that support IP TV, but the downside is that they use 264/MPEG-4 AVC compression for transport.