No flipping way that I'm taking an AS350 off the ground with malfunctioning hydraulics, period. Yes, in my experience, it's flyable with the boost off, but that's entirely beside the point. Emergencies are best handled on the ground, and compromised controls qualify as an emergency. Taking off into an emergency is STUPID, even if it's not illegal where you are.
Really sorry about grounding the aircaft a few days hike away from the road, but that's what I'm paid to do- make the hard and inconvenient calls. This aircraft regularly kills pilots with hydraulics failures, and I have no wish to find out why.
Rant mode off...