Although I think that 50% penalty would be a steep cutoff, there is a real use case for the JUP that would be forfeited from the instant unstaking. For example, the JUP taken from the cutoffs could be passed to the DAO and stored in a hot/cold community wallet used for funding ASR.
In my opinion, the penalty could be 40% as well, and both ends of the string would be pleased accordingly (the said staker and the JUP hot/cold community wallet).
After all, everyone that went into the DAO and staked their JUP agreed first hand that the amount for the unstaking of their JUP would be 30 days, so I would agree to this proposal fully.