Just submit your site suggestion once, and then sit back and wait patiently,
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Even if there isn't a resident editor in that particular category, all editors listed in higher categories can and do edit in every category below them, and there are 200-300 other editors (the ones you mentioned) that are free floating editors and can edit in all parts of the Directory.
No site suggestion has a right to be listed, and we don't want to list every site, just the ones that add value to the category (in our opinion), by containing what we consider to be unique content,
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A suggestion by the public, is just that, a suggestion, if the editor agrees with the suggestion, it will be listed, if not it won't be.
The time frame could be a couple of days to a couple of years before a volunteer editor can review it, so, we advise that you not to worry about it, just suggest it, and promote your site in other ways.