Any rubber line you may want to use should
to be LPG APPROVED or gas will cause it to rot from inside out.
You say that regulator is set at 10psi, generally these type of stoves and connections (off disposable cannisters ) operate at tank pressure. IF it is at 10 psi, you may be safe in cutting tubing and inserting a piece of LPG APPROVED hose.
IF pressure is really tank pressure you are dealing with about 125 psi at 70 Deg. F. and if temperature goes up pressure can reach as high as 250 psi. YOU WILL NOT BE SAFE trying to insert a rubber hose in line because the clamps on the smooth tubing will probably not hold well and may blow off the smooth metal tubing. Most high pressure gas/propane hoses use barbed connectors with crimp on metal ferrules.
IF possible I would find different solution that cutting metal tubing and inserting a rubber hose. Is there threaded connections on EACH end of connector tubing? Its possible that you may be able to find LPG approved rubber hose with crimped on metal connectors to replace metal tubing.
My Coleman stove has same sort of cannister connector with shut off valve, but it uses a rubber hose to connect from regulator to stove.
Another solution is find a hose that has the "male throwaway" connector (1 inch by 20 thread) and a "female throwaway" connector on other end and insert it between tank and "regulator/shut " off valve.
Stock No. F273710
This is a pretty common hose available most anywhere.
OR as "rbeemer" says, move to large bulk fuel tank and adapter hose ( its more economical that throwaway cannisters if you do a lot of cooking on stove)