i have a suggestion if cant find a second buyback executor for the time being but should be a priority too elect one or more as soon as possible
1, while keeping weekly buybacks going maybe have a week day burn for the current total holdings from withdrawals and bought through shareholders not necessarily the full amount
2, have a burn every 2 weeks for current total holdings or when ever the balance is withdrawn from all exchanges the NSR balance bought pending withdrawals are safe in storage waiting too be withdrawn for the next burn
3, get the nubits devs too contact polo directly and get them to increases the daily limit for the NSRBuyback account poloniex are very reasonable im pretty sure they would understand the situation
and make a exception for level 3 Verification for Nushares buybacks
until a second or more executor are elected by shareholders could be a small solution for now