Ok, so several people have suggested that I look into Patreon, and, based on their advice and the web surfing I did today, I think I have a basic grasp of the concept now, and I wanted to run it by you all to get your opinions.
So, I'm thinking that I would set up a Patreon page where I would have you all pledge whatever you felt comfortable pledging to pay for the sort of thing that I usually post here on Deviant Art. So, for every episode of Delve (about 4 per month) and every full-color pinup I post here, I would ask for a paid donation from my patrons. I would still post those things here for everyone to see, but anyone who wanted to could help support my work (and encourage me to actually do more of it) by being a patron.
In addition, for those of you who actually are patrons, you would have access to the super-secret Patron-Only news feed or whatever Patreon does, where I would post a monthly link to a Drop Box drive where I could put all my sketches and stuff that would be considered too naughty for DA (or the Patreon system itself). I think as long as I tag my work as NSFW and keep the Patreon page Private (as far as I understand it, that just means that normal people couldn't browse through the Patreon site and accidentally have their retinas seared out by images of naked elf breasts and slimy tentacles) I should be able to post pretty much anything that I can post to DA through Patreon as well for the purpose of "Paid" updates.
Now this would solve the problem that I'm having with getting my sketchbooks out to you guys without having to route my PDF downloads through New Zealand because no other country will touch my filthy wares or producing expensive Print On Demand books that only the most diehard fans will actually buy.
The one drawback I saw so far is that, since my work is adult in nature, you wouldn't be able to use PayPal, so you'd have to use a credit card or something to pledge.
Now this is all assuming that I can overcome my Luddite Field for long enough to actually get this all working, so no promises yet, but what do you think of the idea?