Well, just suggest your mechanic to work with what hes got or he has to machine a new crush tube
Honestly, it is true that the camber adjustment bolts are weaker than the crush tube but the chance of the camber adjustment bolts to break is different for everyone. The bolts do break just not very common. So it is just preference when comes to choosing between the camber bolts or the eccentric crush tube. Since now you got the crush tube, might as well to ask the mechanic to work with it.