We don't delete nations on request. You can safely continue to use AMING as long as you don't use ALEXANDER anymore. Or you can delete AMING yourself through the "delete this nation" link and then recreate ALEXANDER after AMING no longer exists.
Zero tech and infra shouldn't matter as long as you hit the collect taxes button in time..
I've never been at zero infra though, can you actually collect with zero infra? :lol: