Dude...
Just download 7-zip (if you don't already have software to compress files) right click on your folder with the images and choose "7-zip" > "add to archive".
Then all you have to do is change (replace manually) the .zip file type to .cbz, and open it with your software that read pdf.
(you might need to uncheck trhe crappy windows feature that hide file types in the file explorer 'options', but everyone should do that anyway)
No need to overload the servers with copies of the same files.