Yeah, as “the linux dev” for LB these days I can say with authority that @chaoticmind is 100% correct. There’s no way to do it without us providing an official ARM build. I’ve looked into it actually, but we use libraries that don’t provide ARM builds at the moment so there’s no way.
I too would recommend just buying a cheap computer. I actually just bought a couple $100 Intel Atom based PCs from gearbest.com that would probably work fine. No, not RasPi cheap but not bad. Honestly, if you don’t already have a monitor and such to use I’d really suggest just finding a used laptop for < $200 and throwing the latest ubuntu on it. No, won’t run LightBurn fast but it’ll work fine and then you’ve got everything all in one.