Yeah, the 1/3 rule would definitely be problematic. I wonder if an exception could be made if the actual text was blanked out? It would be following the spirit of the rule, as the text is 90% of the appeal, and one could make a case that it even follows the technicality of the rule, as individual panels from whatever the original sources...
We could do something like a mass post of 80 per week, we'd be through them in about a year. I know people occasionally comment on superdictionary posts with the sources, so the ones people have already figured out would be easy, and I'd imagine there'd be a lot of stumbling onto the answer of one (or several) while tracking down another.
Alternatively, it could be done off-comm (perhaps a wiki?) and pimp the project on s_d (with requisite scan-for-legality) and ns_d (with requisite lack-of-scan-for-legality).
I'm using the word "we" a lot, but I have neither a copy of Superdictionary nor a wide knowledge of potential source comics from that era, so really I mean "people not-me"