Hi Jim,
If I understand correctly, then yes, it is possible. What you do is create a wiki article with a title of TOC. Put your hand made TOC in that wiki TOC article. Then use the TOC shortcode, which is a button in the editor window, when creating a new wiki article. That inserts the TOC where the shortcode is. Leave the category and sort by options blank.
It might take a little trial and error, but I think that should work for you. Here is a bit about it from the description:
TOC Shortcode: With Yada Wiki, you can create a special wiki post with the title of “TOC”, for table of contents, and create a wiki post that will serve as the table of contents for your wiki. You can use wiki links and style the table of contents as you like in the post editor. The second button opens a pop-up for the TOC shortcode.
The TOC shorcode takes two optional parameters: “Category” and “Order”. If no optional parameter is chosen then the content of the TOC wiki article will show in the shortcode location when the page is viewed. Note that the TOC only shows if it has been published. If a “Category” is chosen then that will override the insertion of the TOC content and will instead insert a list of the wiki articles assigned to that category. The category list can be ordered by article title or by article creation date. Title is the default. If no category is chosen the “Order” parameter is ignored.