creedon, as a high-level contributor to this forum, you simply don't get enough gratitude for what you do!
The obvious answer was HTML modification from the beginning, duh! It used to be that everything had a Squarespace ID in v5, and for the life of me, I couldn't find it. That all must have disappeared for 7.1 (I am a little rusty on Squarespace, haven't built something here in a minute).
If you have a buymeacoffee link, message me with it, and I'll throw something your way. I owe you big time!