ISBAT Use my Reusable Blocks in Iceberg; ISBAT Enable 3rd Party Blocks in Iceberg

[heyJordanParker]

Is your feature request related to a problem? Please describe.

I should be able to add Reusable Blocks to Iceberg; I should also be able to whitelist 3rd party blocks for use in Iceberg.
The Gutenberg ecosystem is massive and limiting the editor to just the builtin' blocks is a waste. The "extras" could be in some advanced settings and might not render correctly, but having the option at the very least is critical.

Describe the solution you'd like

A simple menu with on/off switches for 3rd party/reusable blocks.

Describe alternatives you've considered

Going back and forth from Iceberg to the standard editor or leaving TODOs, but that breaks the flow of writing. I should be able to add a Click to Tweet block however ugly it renders.

Additional context/screenshots

n/a;

Thanks!