No, I did not contact Line 6, I will open a ticket, thanks.
I was thinking about making a box or pedal to power the Variax via TRS cable, but I don’t have a circuit and I did not see the inside of the pedal, so I’m afraid to damage the guitar. Perhaps inside the XPS pedals the power supply is not just connected to the ring and sleeve and the tip is connected directly from input to output. There also can be other components. I don’t even know where to connect + and - : to the ring or sleeve. If you have a photo of a pedal inside or a circuit, it would be very helpful.
I'm using the Variax 300 and if you share your solution with a power bank I'll be very grateful. Yes, I have an accsess to electronic parts, no problem there. But I thought Variax powers with a 9V DC? 6AA batteries 1.5V each have a 9V output. Anywhere you know better than me if your solution works.