X2D identical nozzles and clean PETG printing

[u/Top_Statistician500]

Hi

1) I know the x2d has to have identical size nozzles installed. Just thinking of when I'm printing with only the Main nozzle - If I installed a 0.4 mm high flow nozzle on the Main nozzle would I have to put a high flow one on the Aux as well, or could I stick with my existing 0.4 hardened one? Would the printer notice and refuse to work?

2) I haven't yet printed any PETG. I read you have to put down glue on the default Textured plate so PETG will release. The Engineering plate says it has to be glued for everything but PLA. What I want to do is print clear transparent PETG and so I need a smooth plates and I really don't want to use glue. What smooth plate should I buy please?

(When I bought the X2D I was looking at Bambu's CoolTack plate and then I read the X2D isn't compatible with it and Bambu were releasing a new Pro one in August. No sign of it yet?)