Make the squeezable section from silicone rubber tubing - retains its flexibility.
Make the final outlet nozzle the disposable part.
Most pva glues that I use seem to form a thin film of glue hardening on the inner surface of any tubing. May be true only for pvc tubes, so perhaps metal tube with only the squeeze section and the nozzle out of SiR ?
What size line/quantity of glue to lay down ?
I will need something like this eventually for the process line I'm assembling, so I'll follow your dreams