This is not a realistic Batman. This is the force of nature Batman from the comics. He will always win. Batman has nothing better to do than spend 18 hours a day hunting you down. You will likely survive the first encounter, but once he understands your powers he will cheat and counteract every one.
You will have one to seven days before Batman thwarts you evil plan and puts you in jail.
One Day =Minion.
Seven days = master villain.
For example, my villain:
Mr Easy (Commander), he can summon weapons w/unlimited ammunition and up to six tommygun wielding gangsters (also with unlimited ammo).
SCORE 3-4 days.
Defeat Batman will have trouble getting past a wall of unending bullets. Once he figures out that Mr Easy is a summoner, Bats will distract the henchmen and take out Mr Easy with a Batarang and a boot to the head. The summoned minions will just fade away.
Mr Easy is a medium challenge. Bats didn't even call for JL backup.