I used my 60cm 2011 Cab bar on the 17.5 Flite, before the Freeride arrived. The Cabrinha bar actually has a longer safety than the Freeride bar, so it'll be fine.
The kite IMO turns fast enough as it is - on the "lightest/fastest" setting, you can actually rotate the kite around its central axis if you haul on the bar! Think it'll be good for light-wind directional riding... I use the middle steering setting cos I find the lightest too
light and vague... the kite is fast enough that you can get a nasty surprise if you're not paying attention
That's the 2013 Flite though, with 4 struts.
The reasons I prefer the Freeride bar is the stopper, and how everything that could wear (depower line, leader lines) you can replace from your local sailing store. The Cab bar has 6 separate parts between CL and front lines
and some of them are out of stock for ever.
One upgrade I'd make to the bar would be a Mutiny swivel... but it's not necessary except for bling factor