Cool idea! I also like the application you’re suggesting and the percentages of 80%, 90% and 100% are also reasonable. I would suggest end of Q1 and Q2 instead.
This would indeed require quite some coding and small UI addition. It will be up to the team if they like the idea and find it worth putting resources and time into.
More simplified option to implement might even be two options; 1. Get 100% as staked JUP into the DAO with the regular 1 month unstaking time like the current DAO system, or option 2. claim 90% instantly. Could also make a percentage scrolling bar or open field to indicate how much you want to stake and/or claim.
That would be a great way to usher new users into the DAO (and dilute ASR 
).
PS: Jupuary round 1 had a 6 month claim period actually until the middle of 2024.