Rummage Through Blocks - Pebbles Not Included
This modification is specifically designed for skyblock-style modpacks. It allows you to configure any blocks through datapacks that players can rummage through manually or using various tools. Each rummaging action will have its own drop table based on items already present in your mod collection.
All the block rummaging entries you create can be viewed in the JEI interface:

Additional examples and usage guides are available on the project's corresponding wiki page.