You might have to be an early adopter. Obviously the big advantage of PEX is that you need very few joints–in your situation maybe only 2. There are a variety of PEX joint techniques ranging from barbed fittings using the PEX’s “memory” to seal to metal crimp rings and a few others. If you are operating at room temperature I bet you can make it work–the metal crimp rings may be the most robust in your application. I say this from construction experience not lab.