Modelling of Zone Equipment

I have 222 thermal zones. This is a standard size project. I am trying to increase the turn around time on my current simulation. For the proposed design model: I have modelled each of the 13 AHU including the VAV air terminals to all zones. In the proposed design there exists zone equipment including radiators, floor heating, chilled ceiling, fancoils. For each zone, I propose to sum the equipment capacities of all zone equipments to create a single ideal heating/cooling "machine" to be found in that zone. The rated electrical consumption of all motors for the fancoils will be sepperately summed and entered as a user which does not impact on zone thermal loads (process equipment). A PLE (0.5) for the fancoil fan power will be assumed and held constant for when the "machine" is on, and this will be devided by the rated electrical consumption of all motors for the fancoils. The CW and HW energy used by this zone "machine" will be converted into kgPh HW or CW mass flow to account for pumping power based on a dT of 20degC which is assumed an average for the zone equipment (eg. for heating radiator --> 20, fancoil --> 40, heated floor --> 20, ect.) This means the mass flow demand to the Chilled and Hot Water Plants will be inaccurate, but the energy delivered will be 100% accurate. In inaccuracy will result purely from an inaccuracy in resulting pumping power. This is only for the zone equipment. The main AHU and VAVreheat if there is any is 100% accurate. ASHRAE 90.1 does not really elaborate on the modelling of the zone equipment. The baseline does not have any. Would this fall into a "exceptional calculation method"? Would you invest a 6 month period just to model all the zone equipment in detail? Regards, Jean