EG/DC suspension will bolt up with the correct fork and lca combo.
bushing/swaybars + brace etc are all available for the EF9 and easy to get as they are the same as the EF8 (CRX)
even bushings and camber kits are available...
the steering rack has interchangeable parts with a DA6 integra
i even purchased an ASR "ED/EF" rear chassis brace which stops the sub frame tearing out.
to many EG fanboys on ozhonda these days, poor old EF9 doesn't have enough "jdm" factor anymore lol.
so basically if you're smart enough there really is just as much aftermarket support for EF9, but the EG6 will be easier.
but if everything was easy in life it wouldn't be any fun :p