How to get ucg-library onto a large screen?

I am developing a switch board for model railroading. For the project, I use af 320 x 240 color TFT-screen with ucg by Olikraus. Everything works smoothly, but I would like to replicate the graphics on a large monitor.

I don't need better resolution more colors or other fancy stuff ... just a way to convert the SPI-output into something I can feed into a large display (VGA, HDMI, DVI, Video). I don't mind using an adaptor, converter or similar ... but I just can't find anything.

I looked briefly at TVout and VGA libraries, but I am happy using ucg for the small screens. I just want visitors to see the track plan while trains are running.

Best regards Per