Why don't you try and run the HDMI cable and loomex through the ceiling? I've been able to run co-ax, low voltage and 120 volt in the ceiling from one end of our TT to the other without great difficulty. If you take down speakers, AC and skylight bezels, AC grilles and lights, you can fish cable from one access hole to the next access hole until you get where you need to be. If you are stuck part way, you can go up and down inside cabinets and horizontally as well. Upper wall cabinets usually have a 1-1.5" space on the bottom and you can run cables and wiring in there. You can also cut a small hole on the ceiling inside a cabinet to get access.
In 3 TTs now, I haven't been stuck in running wiring through the ceiling to where I wanted it. If you have a go at it, you'll be surprised at what you can do.
Our 2014 KZ TT came with a nice 32" TV that can accept component, composite and HDMI inputs. But the Jensen radio/DVD player only has a composite output. Why do they do this? I will upgrading to HDMI too but will have to ditch the Jensen.
BTW, I just noticed you are in Abbotsford, just down the street from us in Langley. If I can help you at all, send me a PM.