Hmm I'm not very familar with chromebook sadly. We have had players on Linux based OS before, but not specifically chromebook.
From what I'm reading it runs android apps.
The players we've had on Linux before were using a Windows emulator to run heRO. If you can run a Windows emulator I'd say maybe, otherwise I think it sadly would not be posible to play on a chromebook.
Architecture might be an issue. If you are not familiar with doing command line work arounds, might be straight easier to get a laptop. It's doable, but needs to set up some configurations beforehand.
Anything that is sold nowadays can run RO. It is really a simple (and old) game. Just go within your budget and try to find something you like about the notebook. Or use other game as base.