I’ve added this as a feature request as I don’t think there is a way to do this.
I have several trading styles and each one works in a completely different field/area. I have several clients who I do work for in all of these areas and these clients also get billed using recurring invoices. Most of them currently have recurring invoices sent from one of the trading styles only so as a workaround I can set those clients to that style by default for now. The problem comes when some of them have recurring invoices sent from multiple trading styles, which is going to happen.