simple bot using Yuumi ?

Hey.

Does anyone know/create a yuumi leveling bot ? that just queues up, and attaches to someone in bot games? (re-attaching after they recall/die ofc)

Idk much about making bots but i could imagine it would be easy to make? possibly harder to detect and get banned (idk how riot detects bots though)

They usually don't detect through pure gameplay. So just because it's easier to act like a human being, it doesn't necessarily turn down the chances of being caught botting.
But yes, it should be easier to code at least.

To wrote a bot which play only one champ is easy (see Elixir Bot), but this bot isn't rentable. Because only ONE guy per match can play Yuumi, and that's why it's limited to botting them, and no guy which brain will sell something like that. Just using of their own, and the League community will report you because you don't play, and then you get a target ban.

Writing bots for specific champs isn't good and will never been selled. If you ask someone, they create you maybe this kind of bot, but then you need to pay for that, or, as I wrote, you take Elixir Bot and play Soraka.