I find these old videos (from 12 years ago) a hidden gem to learn how to make our own symbols and catalogs:

The original playllist is this one (Symbols, Control points & Varicolor):

.. but the following 5 videos were never added to that playlist, so I added them to another playlist (plus a few other videos I also value very highly):

The croppping/slicing also works. And you can do both things in one go, at least with a new version of ImageMagick:

magick Greengulf_WIP.JPG -crop 800x1100 +repage -units PixelsPerInch -density 100 -page 850x1100 output.pdf

(note that I switched too 100 dpi for this example -because I was being lazy-, so the page size was adjusted accordingly)

And this is the result (I maximized the thumbnail panel and minimized the page display for this screenshot just because it looks better here in the forum).

And all pages are 8.5x11 inches as needed.

EDIT: If you own Annual Issue 129, you should be able to create your own copy of tile10x10.scr and tile.cmd, and tweak your copies to do everything from within CC3+.

I'll drop my $0.02 here...

I use Scribus for this.

Following your requirements, I'd export a raster image with the 8x10 area to the edge. Then set up a page in Scribus for a 8.5x11 sized page. Insert an image frame sized 8x10 and center it. Import the image to the frame and make sure the image is scaled to the frame. Then I export to PDF.

Huh. Hadn’t even bothered to ask myself that, but I think the current bundle doesn’t include these.

I browsed my Humble Bundle account and found these:

I don’t think I’ve seen them in any of the annuals or addons. And apparently I didn’t pledge on the highest tier for the Cartographer’s Vault Bundle.

The current bundle has almost everything included. Notably missing are the last two annuals, but little else.

I listed everything included in this post: https://forum.profantasy.com/discussion/comment/124188/#Comment_124188