Payables - Taxes on Sales Tax line can only be posted to one GL account

I'm looking for an answer from the Community.

Oracle Support describes this as "working as designed" and suggests that manual changes or a customization are required.

I'm curious what others have done if they experience the same problem.

PS FIN 9.1

PT 8.51.16

We need to have Sales Tax entered on the Voucher Header be posted to one of two GL Accounts.
Which GL account is determined by the Province on the Voucher Header.
This is driven by the fact that Quebec Sales Tax is partially recoverable and all others aren’t, so we want them in different accounts.

Currently, in 9.1 Payables, the Chartfield for the Sales Tax line on a Voucher is driven by the Accounting Templates. Only