SCR TIC106N ltspice model

Maybe you could roughly model it by cross-coupling an NPN and a PNP and put two resistors between bases and emitters to get about the right trigger and hold currents.

anode to PNP emitter
PNP base to NPN collector
gate to NPN base and to PNP collector
cathode to NPN emitter
resistor between NPN base and emitter
resistor between PNP base and emitter

Maybe you need to put yet another resistor in series with the gate to ensure you cannot turn off the thyristor via its gate.
 

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