Want to Buy WTB Viewfinder

I’m looking for a viewfinder for a new incoming camera. Preferably a Mamiya 65mm finder made for the 23 press camera. Second choice is a 28mm viewfinder made for 35mm such as Leica, Voightlander, etc. I just bought a new SmallRig 28mm viewfinder but it is very small and I need to put on my reading glasses to see a sharp image.
The new camera will be a 3D printed 6x9 and I will be using a 65mm Super Angulon on it.