I've seen multiple knowledgeable people on this forum say that you shouldn't combine Content Controls with legacy form fields so you probably shouldn't do that (although I'm unconvinced this is a real problem).

If it was me, I'd be throwing away the legacy form fields and replacing them with content controls (and as a bonus, adding a custom xml file to link the fields to). There should be no real change to the way the users add data with the form although the ability to add/remove tables would be new to them either way.

If you stay with the legacy fields, you can still use locked forms if you are using with macros to do the add/remove. Changing to Content Controls removes the need for macros while still being in a locked form.

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Andrew Lockton
Chrysalis Design, Melbourne Australia