Yeah, no, from the libertarian perspective, self-ownership is a natural right and therefore inalienable. You don't get to decide when the individual is or is not sovereign over his own person, otherwise there could be no private property.

Look at it this way, if self-ownership is conditional, the individual's bodily autonomy is subject to being violated by other individuals and the state. This opens the door to human enslavement and trafficking. Put another way, if self-ownership is conditional, a tyrant has a right to enslave a nation's inhabitants or force them to participate in a communist economic system because the land he rules over is his own private property.

Without self-ownership, you cannot avoid being used and abused by others more powerful than you, hence its importance for libertarians.