[Otto]

Hi there legierk, and welcome to the Shack.

Unfortunately, I don't think what you want is currently implemented in REW. REW assumes that we are using a fully parametric EQ. REW also selects bandwidth when you choose "assign filters", and I'm not sure if that parameter is selectable on your EQs. You can probably determine the bandwidth of your filters. Then, you can force REW to consider only your bandwitdth and frequencies. Then measure and play with gain to see predicted response. You can also "save" pretty much everything in REW so that you can use it from a clean slate in the future.