user42212
I bought them from bol.com in EU, but they are also available from Amazon.
One place to start looking is in the source code of the QMK firmware. They have subfolders for many keybaords, and most of them have a picture. https://github.com/qmk/qmk_firmware/tree/master/keyboards Most of them are hobby projects though, so soldering will be required.
Just an idea: you could attach the two halves of a split keyboard to a wooden board. The piantor is a corne-like split with hot-swap choc v1 sockets that has been designed to keep soldering to a minimum. Some soldering still required though.
Update: the velcro tape is also really good for sticking them to smartphone holders.
Please tell us more about the angled risers. What are they, how do they look? Can you post a photo?
What is the difference between the MX and the choc version? If I understand correctly, chocs also fit in the 14x14 mm plate holes that the MXs need. And since you’re hand-wiring, there is no PCB with different holes. Shouldn’t the chocs just fit the MX version?