The Lumatone is a high quality isomorphic keyboard. There's software to control the layouts, and you can use layouts other people have created: https://en.xen.wiki/w/Category:Lumatone_mappings . I'll warn you though that the keyboard costs around 4000 USD, and it's around a 2 month wait for the company to build it and ship it after the order.

https://www.lumatone.io/