TaskUpdate Script: Using a user-defined field to populate in the title of a Requests task

Hi folks,

Is it possible to use taskupdate.py to populate the contents of a custom field for a ticket within the ticket's tasks?

We have a user termination process with a ticket that has about 20 tasks. The title of the request is formed using a form rule and takes a custom field. For example:
Customer field = Employee to Terminate: John Smith
Title = Terminate Request for user: John Smith.

Each task says something like:
Task: Terminate AD Account
Task: Terminate Salesforce Account
Task: Terminate Slack Account

It's confusing, so we want to add the employee name:
Task: Terminate AD Account: John Smith
Task: Terminate Salesforce Account: John Smith
Task: Terminate Slack Account: John Smith

I've been able to use the taskupdate.py python script to populate other fields from the parent ticket into tasks. However, I can't seem to do this for a custom field.

Is it possible? If not, are there alternatives?

Thanks,
Adam