You have no choice if you want to serve IOS users, even if you do not need the app store to sell your product. The #1 questino for any IOS/Android exclusive app is "are you making an Andoid/IOS version"? And saying no because Google/Apple won't let you isn't a resolution that satisfies any party.
How did you have no choice, did Apple threaten you or something?
Android is a competent competitor you could choose instead.