Ah yes, I've been there and can empathise with that
1.1.5 doesn't specifically mandate a senior management meeting on a monthly basis, but rather that there will be a meeting program that allows issues to be brought to the attention of senior management.
How far away you can push this from the largely expected monthly senior team meeting will depend on how much you like arguing with BRC auditors, but there is perhaps theoretically some scope for an alternative approach.
Nonetheless the types of issues that BRC requires to be covered are such that it probably requires all of the functions you've listed.
It's not unusual for departments to want all things BRC-related to sit in technical (or indeed anywhere other than their own), but this isn't the reality of food manufacturing, and indeed the latest BRC standard very much recognises this through the new Food Safety Culture requirements. It's a battle that many of us have fought