Official comment
Unfortunately without a KUVO box, there's no "to the internet" kind of functionality. Personally, I'd love to see that incorporated into rekordbox at some point in the future, but for the time being, it's not available for the end-user (only clubs, as you mention).
As @Beekir says, you could try and reverse-engineer it yourself - I know Armin van Buuren's technical team have built their own application that sends the data from Armin's rig to the front-of-house team so their lighting and video operators have programs that sync up to the beatgrid. It's really quite amazing, but also not something available to the public either.
I'm sure that Pioneer may ignore any personal projects of this nature but anything commercial may be pursued by legal.