All OSBot scripts are unlimited instances, and most of them (including this) are lifetime
I'm afraid I'm not currently doing trials
It does work through CLI, the iron man/debug mode are saved into the presets, so if you create an iron man mode preset it should start in iron man mode
I'm afraid I'm not currently doing trials
It should be able to continue if you start in debug mode (press F4 while the GUI is open, title will change to Stealth Quester (debug mode)), where banking and GE are disabled, but this has to be done with the required items in inventory and at a location close to where it was interrupted (for Underground Pass, this may work if you just start the script normally at bank if you already left the cave)
It's not iron man friendly, there is an iron man mode but only supports 9 quests, I generally don't recommend for iron men
I'm afraid I'm not currently doing trials