I think there should be tiers for several instant withdraws. Pay 15% and get your stake now. wait 1 day pay 10% wait 3 for 6% and wait 7 day for 4% just a quick example. if someone wants their stake to be instantly liquid they should pay at least these fees. I wouldnt't even burn it but feed back a portion in the reward pools, and pair the rest with a stable on a dex for liquidity.