I had an idea about these missing issues, which could solve a few issues. Would it be possible to put just the covers for these issues online? The file comment could indicate that the rest of the issue can't be hosted for legal reasons. This way, new uploaders would see the cover placeholder and be less inclined to upload a missing issue. Plus, the GCD details could be linked to the cover upload. I would think that just the covers would be okay, since GCD has been allowed to host even Disney, Marvel and DC covers for years now.
If covers are acceptable, then perhaps other partially allowed titles, such as Super Duck and Wilbur, could potentially be filled in (up to the 1960 cutoff).
Does anyone else think this would be a reasonable compromise?