You can remodel only single set of device components, i.e. you can run single modeler plugin and it will update only components it's responsible for. However, this is tricky, will take a lot of resources and will not do the job by the end of the day.

I would suggest to configure switch to send traps on ifOperUp/ifOperDown and to create an event transform in snmp_linkUp trap mapping which will update the parameters of specific interface and set the actual speed. (Don't forget to use commit() at the end of transform). The simplest case will be to set statically 100Mbps or 1Gbps just to avoid alarming or you can do snmp query from transform using specific interface index and set the actual speed. However, in this case you shall be a bit careful, as traps are very fast and switch may not yet update snmp table with new speed.

In case interface is not actually goes down or switch is not capable to send traps you still can you the above solution, but shall apply it to /Perf/Interface class transform. Make sure you check event severity in the begining of transform script and do queries/updates only in case of alarm, otherwise the performance will be severily degraded.