Once I put up that screenshot of the detail marker, I noticed that the gibberish components of the two autotexts are the same. The difference lies in the DRAWINGNUMBER_R and LAYOUTNUMBER_R tags at the front.
This means I can have reference markers (section and detail flags) that just need to be told the gibberish segment once, and can build the autotexts themselves. For these objects, instead of copying the entire autotext in PlotMaker, just copy the data within the second pair of angle brackets: "<9BEA5D4E-8700-11D8-8AA9-000A95A7B33A>".
I have added this ability to Detail Area JAM9. In the settings, paste the gibberish into the "Paste Autotext Here" field. In the drawing and layout number fields above, you will see the completed autotext fill in. You can still put non-auto text in these fields; if you delete the "Pasted" data, the fields will empty and unlock, and you can use them however you want.