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You are asking for an option to save your accounts on the bot, yes the bot has it.
Your accounts data are held in files in the emulator called "Shared_Prefs"
The bot has the ability to extract those files and make copies of them, then push them back into the emulator when needed.
That's exactly what the function you're asking for.
If you don't want to use it, (why not? it's the only switching method I use) then there's no other option that covers what you're asking for.
Or am I missing something?
It's possible lol, let me know if I am and I'll try and help further