Hey DJtaka,
You could remove the valves from the Rhino bladder and seal them with some tear-aid, then buy some U-stick valves and reposition them in the correct position for the Vegas.
This should cost you about $70 for the parts ($26 for each valve and $17 for Tear-Aid).
A little time and ingenuity and you'll have a bladder that works for less than half the price of a new one. Yes, I have the parts you need or visit your favourite local quality kite shop. I'm sure if you ask nice, they'll even help you.

Cheers mate,
KH