Is there anyway to access the capabilities of my revit addins in Dynamo? either directly or indirectly through keyboard shortcuts or anything?
If your addin is implemented in .NET then you can try to import the addin dll in Dynamo using File->Import Library menu in Dynamo. Then all the public method from your addin will be available as nodes in Dynamo.
What do you want to access from you revit addin in Dynamo? If you can also fine tune the implementation to best suite Dynamo. Checkout: https://github.com/DynamoDS/Dynamo/wiki/Zero-Touch-Plugin-Development and https://github.com/DynamoDS/Dynamo/wiki/How-To-Create-Your-Own-Nodes