i.e You mean if the FTR switch was stuck "closed".
You cannot simulate this as the clutches require electrical power to open. If the switch was stuck closed which is highly unlikely as there are two sets of contacts both of which would have to be stuck.
Hardly a difficult situation. Like flying a B206 - yawn.
"If" it did happen - Pull CB "ATT TRIM REL" Overhead panel 12VE Breaker 7CC 1 Amp driven off PP10E Bus.
Is it illegal - most probably.