Should have found https://open-meteo.com/ - it aggregates close to all the open data available from NWS's around the world.

Balls. Having dug into it now, this would have been so much easier and more reliable. I guess I'm rewriting the script! Thanks.

Cool. I actually use both the deterministic and ensemble outputs for a 318 member mega-ensemble in my area and use 10/90%, average and median.

I did look into them a few years ago but back then they didn't offer ensemble forecasts. Now they do! I'll look into it.