Will the xml file work?

There's an available xml for the Alinco DX-SR8T

That's where the issue is, the CAT controls are on hamlib there's no manual provided by Alinco for CAT commands as this radio didn't natively support it. Some hams have figured out how to make the port that was used for a feature that normally would be used for transferring data from one radio to another in order to accept CAT

I do use FLDIGI but it's using the Hamlib Repository