Not by device with one radio. But the Ap might have overall total limit or its uplink is limited. Are you sure you can get more throughput by more clients at once? And anyway you will never get more on single connection.
Maybe the limit is per ip. Just try to bridge client wlan with more devices on you side, let them to get ip and try what they are able to get. You need to observe and make own tests with different approaches to find the best possible option.
It looks like the station-pseudobridge-clone mode is what you need.
This mode is the same as station-pseudobridge mode, except that it connects to AP using “cloned” MAC address - that is either address configured in station-bridge-clone-mac parameter (if configured) or source address of first forwarded frame. This essentially appears on AP as if end-user device connected to station connected to AP.
I would think that this causes the bandwidth limit to be applied per end-user device instead of per outdoor station.
On second thought, it probably is NOT what you need. Yes, it will clone the MAC address of the client, but only the first client to connect, not for every client that connects.