An account can have several hotspots.
Maybe you need to create the hotspots under your main account, and share them with the subaccounts.
The possible problem you will have with this is that if you share tickets with subaccounts, all subaccounts will "see" tickets of other's (all will share the same tickets)
If sharing tickets is not a problem, this is a good solution.
The problem I see with your setup, is that because you disabled subaccount hotspot management features, and as the hotspot are owned by your subaccounts, you won't be able to manage them. You will have to reenable the hotspot management features, then disable them again.
A solution for this might be to create 2 level of subaccounts: they won't have the same tickets.