Hi Brian,
From personal experience... The fundamentals of any database front-end are the same. You already know what concepts you want to present. For update purposes make sure the underlying database is exactly the same as the Android version. Many Subroutines from B4A you will be able to recycle verbatim, however.....
The page handling in iOS is different and user interaction more strictly defined.... With the above in mind.... I have always found it quicker to start from scratch.