I'm looking to do something similar, i.e., stop using the Force.com IDE altogether and switch to TWS. I don't actually want to touch anything in my force.com ide project, I would rather just 'copy' that project to TWS and leave everything related to my Force.com IDE project as is (e.g., the folder, git history, the settings, etc.).
I understand that 'copy' might not be the right way of thinking about this, but how do I get all my files and local git history + branches into essentially what would be the same project, but in TWS? Again, I don't want to mess with deleting anything in my existing force.com project folder, especially when the above member of the TWS team is 'not 100% sure' that such a solution would work.
(Some information about my workflow: I'm using git but doing all of my commands at the CLI. When I make changes to files in Force.com, git picks them up and I can commit them. When I save a file in that IDE, it pushes those changes to the sandbox. I can also deploy classes/triggers to Salesforce production easily enough, and I'm looking to replicate that functionality in TWS.)