That’s true. The original airdrop can technically not simply be “continued” or the deadline “extended”.
What we are really talking about here is a completely new potential airdrop, including a to-be-discussed definition of which addresses would be eligible, and under what conditions.
Practically speaking the proposal [SEP #5] Redistributing Unredeemed Tokens From User Airdrop Allocation might focus on the question whether SafeDAO should allocate more to those who had already redeemed the first airdrop, but that other proposal might also might also include options to explore other alternative airdrops, such as the proposal discussed in this thread.
To @Bendicion as the author and others, how would you like to continue here? Wait for [SEP #5] Redistributing Unredeemed Tokens From User Airdrop Allocation to define its final voting options, then focus on aligning on a precise definition (and technical definition) on which addresses should be part of such a new airdrop?