But conscription also offers non-combat or non-militairy paths.
True, but there's the risk of those positions already being filled & I'd be bound by the military for however long the mandatory military service is.
Alternative service should not have a maximum quota. In that case, yes, it is against civil liberties.
No, because you still voluntarily choose the military path.
Under some circumstances maybe but could you guarantee that for everybody?
Yes. You are given a choice between two options. You choose one.