Hi Harwood39,
I understand that your company has needs that may not be met with the replacement software that we partnered. However, I can't suggest a different one because the list of third-party apps we have is only for QuickBooks Online and QuickBooks Desktop. We don't have a list of apps for QuickBooks Payments.
You can still use QuickBooks Point of Sale to its full capacity until October 3rd this year.
Feel free to come back to this thread if you have other questions in mind. We'll be happy to help you again. Take care and have a good one.