Consider https://www.irs.gov/payments/direct-pay as Lacerte only gives you one shot at doing it through the program.  You could create vouchers and mail the payment. 

This is in one of today's e-newsletter email notifications for Tax Professionals 2020-27:

3.  Additional retail partners accepting cash payments for federal taxes

Additional retail partners are accepting cash payments for federal taxes for both individual and business taxpayers. The IRS's continuing partnership with ACI Worldwide's OfficialPayments.com and the PayNearMe Company allows taxpayers to make a payment without a bank account or credit card at participating 7-Eleven stores, Ace Cash Express and Casey's General Stores nationwide.

Individuals wishing to take advantage of this payment option should visit IRS.gov/payments, select the cash option in the "Other Ways You Can Pay" section and follow the instructions.