So there are two issues where that wont work unfortunately, first the original mount doesn't let the game sit any farther into the slot and its lever action would not push that extra 2mm so if you shaved down the part that pushes the game out to allow it to sit in deeper it would just end with the game getting stuck.
The second is the new flex is shorter since I have the game sitting in squatted to the system. That flex doesn't reach to the height of the original mounting structure.
If you bought the 3d files or an original Slotmaster I can provide the new files for free if you just want to buy a hardware kit. Or provide a discount code for a new kit or assembled unit.