It'll continue to live to some extent... not sure it would be a net benefit, though. it'd absorb some but not enough nutrients for the plant mass, i'd assume. maybe multuple smaller branches, but still.... would need some sort of indoor lighting to make that worth it too.
unfortunately no way to fast forward time.
Staggered harvest an option? sounds like not, but worth a thought. cut top bulk off should improve airflow / reduce microbial growth.