Not a JRPG, but you guys need to check out Metal Wolf Chaos. It’s a game where the president uses a giant robot to save America from a rebel army led by the vice president. It was originally released as an Xbox exclusive and only in Japan, but there was a remaster for PS4, Xbox One, and PC that was released worldwide. Also, it was developed by FromSoftware.

Gunpla gives me great joy, until I look at my bank account.

Assuming you mean legally, the best options are Paramount+ (or whichever service it’s on outside the US) or on Blu-ray. None of the television series are available in 4K to my knowledge, but the movies are.