That’s too big. 1.05x25.4=26.7mm. There are different versions for 25.0 and 25.4mm. 26.7 is not going to work.
Pipe is measured by what it can carry (ID). Tubing is measured by it’s OD. Instead of finding a plumber, you need to find a welder.
If your town has a mechanic, then they have a way to get tubing. I wouldn’t bother with stainless steel. Just DOM steel. It can rust. But not very fast, and some parts wax will stop it.