You say the wire has been cut - how much length of wire do you have coming out of the bottom of the tonearm? Is this not long enough to connect to the signal terminal block, which you can then connect to some RCA sockets in the side of the plinth?
Tonearm wires need not be routed through that terminal strip under the platter if RCA female sockets are introduced on the plinth backside. The wires can be terminated Directly on these sockets and is possible with a shorter length exiting the arm piller.
Looking at the various difficulties and issues the OP is facing, perhaps he may better of seeking professional help ?
Regards,
Anwesh