From what I understand of it the hubs on an EF1 would need to be swapped with hubs from a VTEC civic of the same generation (EF9) in order to go 262mm. So it would be possible if you buy hubs off an EF9. I think you would also need EF9 TRE's or your suspension alignment would be wrecked.
I'm not sure about EG civics maybe someone else on here can help.