From what I understand V-band clamps should hold way over 100psi of water pressure. They've been around for ever in the plumbing industry. I dont see why they wouldnt take 15 psi from a stock T28.

That is the first time I've seen V-band clamps under 100$

I cant weld aluminum. The ones I posted are Mildsteel rings with Stainless steel clamps.