Select Custom Transaction Form Automatically based on Vendor

We have created different Custom Transaction Forms for some Vendors as the Purchase Orders have different information depending on the Vendor.

I wish there was a way to specify in Netsuite when creating a Vendor which form to select as a Default but you can't.

Is there a way to create a script that when a Purchase Order is created from a Sales Order to automatically assign the Custom Form based on Vendor Name?

Example:

if VendorName = Vendor 1 then use CustomForm1
if VendorName = Vendor 2 then use CustomForm2
Else use DefaultForm

Any input is appreciated, for now we need to edit each PO when created and select the Custom Form manually which is time consuming and sometimes causes mistakes because we forget to change the form.