Ability to upgrade individual seats in a Team for AI

My work unit is part of a larger Team subscription. We want to upgrade our 6 seats to use the AI features - the work units that occupy the other 35 seats do care about it, so that would mean that our small unit would have to pay to upgrade all 41 seats, which of course we can't justify. It would be much better if there was an ability to upgrade individual seats in a Team. Or to create a sub-team that is upgraded. We are looking at create a whole separate team, but then we will lose the volume discount of being in the bigger team (and the central software management team aren't keen on us being separate).