Questions regarding EPC method

We would like to know if from the standard EPC method, the following questions make sense.

1. In EPC, is it allowed to use objects like Roles (like Employees for example) to trigger/start an EPC instead of an event or a process interface?

1. Does it make sense to create event/Triggers objects as start of an EPC, with the same name than an Input/output of that process shown in the VACD?

    

2. Is it allowed to use an IT tool as a trigger of an EPC?

    

3. In EPC, is it allowed to use External Supplier objects as the one used in VACD?

Many thanks in advance for your support.

Best regards,

Lucía