Technically speaking the most difficult point I encountered emulating the EM is the feedback path eq because there is a relevant first order low-cut filter in place (RC = 4n7*100k -> 338Hz!).

I haven’t still found a digital flanger effect that let me equalize the feedback like that and, unless I set feeback (aka color) near to zero, it sounds really different.  Cheers  Teo

Have you tried using the H9/Timefactor Mod Delay?  FILTER in the negative range, flanger DELAY times, high (but not too high ) FEEDBACK?  I don’t know what the FILTER corner frequency is, and it’s not very steep.  But I’ve managed to wrangle some nice AD-220 Multi-Flange and Analog Delay presets out of it.