Bill, you do realised if you copy & paste a WB or drag one from the Local Designs gallery or Import from Elements onto a Freeform design page the content is presented in a Group without the WB capability.
You can spoof the FlexGroup to work as I covered above.
If you set Push & Autofit to Page Bottom, you almost have a Flexible Block capability without the worry of a Variant.
Acorn
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