Can the Schwalbe be fixed? Some tubulars cannot be fixed (Tufo, for instance) but only temporarily sealed with latex... I would not bother with those.
Also, if a tubular is not at least better than a clincher tyre, it's not worth to bother with it, given the amount of work involved in fitting them...
that's the reason why I would steer clear of cheapos... false economy, the tubular route is an expensive one, but can be rewarding