kermiit

If you mean just to get one account at a time launched on the script you want. You need to go to the script launcher section and select the account you want to launch in the dropdown menu at the bottom of the script selector gui. Then launch the script you want and it will login that account and start the script.

Wouldn't matter if the script still existed we have to create Jagex accounts now with verification. You could still buy old logins or tut completed accounts pretty sure some people out there are heavily stockpiled.

You could use eternal farm it works with many botting clients including dreambot. https://discord.gg/N9xruC5GP3

You can use this tool created by a user on this website.

Are you looking for web automation like using selenium? https://www.selenium.dev/documentation/

Not sure if anyone has responded to you yet but you can buy vouchers on this site for osrs gold. https://dreambot.org/forums/index.php?/forum/132-vouchers/

It will reduce the likelihood you get a chain ban but 2 accounts doesn't really matter. It's when you are probably running 5 or 10+ accounts on a single IP that you could be chain banned.