Looks about right. Just get the right hose length for the T port to the manifold.
Whatever you need to remove the pipe fitting.
Looks as though they got a hose with -10 JIC ends, and needed a way to adapt it to -08 at the manifold. And thats all they could come up with.
Depends on how bad the hose is damaged/kinked, and if within budget, just get a new hose to replace that one with -08 ends instead of -10 (just like you are going to do for the tank hose)
And get a second -10 ORB x -08JIC 90* fitting to install at the valve.
(basically make both hoses going to the manifold block the same)
So I'd get 2 hoses with -08 ends (whatever length needed probably closer to 3')
2 of the 90* fittings for the valve that go down to -08
1 tee.