Hey Mike,
I cannot influence what the Onefinity manufacturer does or will offer to you, but if you already have all that stuff, and it’s just the sensor holders and/or triggers that are missing, you could really look if someone who has a 3D printer and some time makes them for you. Many people in this forum own a 3D printer.
Image: Tom’s inductive proximity sensor holder (3D printable)
I know this is not for your Masso photoelectric sensors, but for cylindrical inductive proximity sensors, but it shows how simple it is technically.
The Onefinity proprietary housing for the Masso photoelectric sensor and the trigger look this way:
No rocket science for someone that has a 3D printer, can do some CAD/CAM, and is willing to help you.