That's how my valves and shut-offs are configured.
I was told that the recirc system wouldn't pass muster at a track event even though it would keep 90% + of the hot coolant out of the cockpit (my estimate).
On hose sizing - a person could do that, but I never even considered changing the stainless tube.... That looks like it would be a lot of (relatively precise, skilled) work. I never thought the hose install would be as hard as it was.
I knew the hose would go on..... But it was tough to do.