Fluent EDEM coupling - save simulation time by passing CFD field?

Hi, 

I noticed that in the latest Fluent -EDEM coupling tools in the forum, the coupling tool computes coupling forces on each individual particle and send it to edem. However, in Fluent - Rocky coupling, the CFD fluid field is passed to EDEM and fluid forces, such as drag force is calculated within rocky DEM.

Is it possible for Fluent -EDEM coupling to do the same thing? Since I am simulating very fine particle, whose size is up to one micrometer. And my problem is both EDEM and Fluent has to use a very small timestep. EDEM 5e-9s and Fluent can use at most 5e-6s . If I further increase the Fluent timestep, unrealistic high velocity particle will be observed. But I want to calculate a total of 1s so the full simualtion is very time-consuming. However, I noticed that in rocky -Fluent coupling, the Fluent timestep could be set to 1e-4, or maybe 2e-4 and the simulation could run well.

So is it possible for Fluent-EDEM coupling to pass CFD field? Or is there any alternative way to increase Fluent timestep to save computation time?

Regards,

Yang Qi