I doubt this will work in your application but I occasionally have to attach hard plastics of dissimilar materials together some times when repairing plastic bodied water pumps or plastic tank fittings and I often use a simple friction welding method. I just hold one stationary and the spin the other one with a drill at high speed with a bit of force and they heat up and mix and then weld themselves together.
These are being used as flexible couplings to connect carbon fiber rods together. But in order to connect two rods of two different diameters, you need to have an insert of smaller diameter tubing into the larger diameter tubing so you have different ID at both ends.
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