If you want to just use a cRio as a demo bot or what have you, I'd recommend
Thunder cRio tools. I haven't used it, but it should let you use Eclipse to compile.
When trying to enable I believe you would have to select 2014 protocol or cRio on the driver station.
I recall on one of the CSA calls they were thinking of releasing the rio<-->DS protocol specs, but did not finalize on a date to release it.