Thanks for your reply! I fully understand you refusal to invest work in an elaborate but futile modification for a single T50-CM user. I wasted more than 10 hours of my life, trying to learn Fusion360 in order to cut a simple rectangular hole into an existing .stl model I downloaded a year ago. I gave up in frustration and desperation… So I know how much work these modifications are… 
Also thanks for the offer to send me the “hardware”, whatever that means (Sorry, english is not my first language)… 
I still have some questions:
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Could you check if these plungers would work? https://www.amazon.de/Generic-Socket-Drive-Spring-Plunger/dp/B01LK6Z2CS
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How many plungers are actually needed? I figure that 4 would be the right amount.
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How many M3 screws are needed?
EDIT: I found your manual for the CM2 version and it says “4 or 6 of M3 30mm. 0 or 2 M3 18mm”. Is that right for the T50-CM version, too? -
I saw in your manual that you use the cylindrical head screws.
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Where did you find the 18mm M3 hex cylindrical head screws? I googled around and I can only find 12mm, 16mm and 20mm schrews.