OK, rummaging through my old C-Record stuff, all of it (and all Chorus too) is fittable in the aero configuration. You will need to drill the holes in the right places as Campy are fairly limited on where the cable comes out from, certainly I remember on the Powergrades I put on my Campagnolo Brompton it ended up being easier to fit them non-aero with a set of not-C-Record hoods, though I might revisit that, but likely only if I can find a set of standard aero-only Powergrade hoods in white (don't care if Campy or aftermarket) .... You have to brake away a piece of the lever body to fit the C-Record/Chorus/Croce d'Aune/Athena in aero positioning, and that breakout piece tightly constrains where the hole would need to be, everything around it is load bearing...
BTW, I would thoroughly recommend not drilling your handlebars until your family has take out significant life insurance policies on you BTW. Whilst the one at the control ends won't cause an issue the ones near the stem pretty much need to be factory things otherwise I'd never trust the bars again.
