The focus of Braiins OS+ is automated efficiency (its not about blind speed). Rather than changing speeds and voltages, what you change is the power limit and let the algorithm do the rest. In fact, you want to change the power usage and not mess with anything else and that's exactly what power limit is for. You are specifying watts the miner is allowed to use and let it sort out the rest as efficiently as possible.

The API documentation is here: https://docs.braiins.com/os/plus-en/Development/1_api.html

You could just swap the power limit and restart bosminer via ssh, schedule (crontab), or some custom script. Ask me on the telegram group if you need help with getting a script to change the power limit at specified times of the day.

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With the toolbox you use a command like this:

bos-toolbox install -p password 10.10.10.10

Typical password for stock firmware is either root or admin. It may be something else if this was changed. Else you can use the sd card if the password is unknown.