Spectre: use models on a per module basis?

Hello! Is it possible to tell Spectre to use different models for the same devices in different modules? Our design kit has standard and "PRE_SIMU" models (=include contact-to-poly caps and parasitic contact and gate resistances) for the MOS devices, and we would like to use these PRE_SIMU models only for the devices in specific modules, at different moments in the design cycle:

-In the early design phases, use PRE_SIMU models only for the critical blocks in the system, and standard for the rest (speeds up simulation time)
-In the later design phases, use PEX views for the already laid-out critical blocks, and PRE_SIMU models for everything else not yet laid-out.

Currently all I can do is define these models globally for all the devices using the Model Library Setup window (need just to include a section from the model libraries). However, as soon as I use PEX views, I need to switch back to the standard models, as using PRE_SIMU globally would yield incorrect results due to double-counting of parasitics in the modules with PEX views. Thus the accuracy of our simulations gets compromised as we proceed into the implementation cycle and start to add PEX views.

...any ideas on how to overcome this problem?

Thanks in advance for any help.

Jorge.