Is there anything close to the EHX Super Ego in the DIY community?
Thanks
No.
It's a dsp effect (a complex algorithm as well I imagine).
DSP is still an emerging area for DIY projects.
The closest thing I've seen in the non-dsp DIY world is this
it is pt2399 based so don't expect too much fidelity nor control
go to diystompboxes and search for "~arph" "sentinel"