Script to remove Item/Values and Dropdown Items not loading correctly when requesting signature

I have a Acrobat Form with a Dropdown field involved via its Export Value in a calculation script executed in a Text field.  Form fields work fine in Acrobat. When I request signatures, the dropdown Item selected reverts to the 1st Item listed in the Dropdown list in the Options tab. The only solution I've discovered is Deleting the Item/Values in the Option tab of the dropdown field and adding them to the field name per the Adobe tag guide and assigning to 'prefill' role, but this prevents accessibility to the dropdown when completing the form prior to sending for signature, and hence the calculation. Currently, my Acroform dropdown's Exported Value participates in the calculation prior to requesting signatures, so it's fine if I can find a solution to the following.

Is there a way to keep the original Item selected in the dropdown field's Option Tab in the Acroform to display in the SignForm dropdown field when requesting signatures? Or is there a scripted way to remove the Acroform's Items/Values listed on the field's Options tab prior to requesting signature?

Thanks in advance!- kemper