If you are using bromine with tabs in a floater then you are better off since it's far less likely for you to have too little bromine in between uses. So yes, once you get a rough idea of your normal bromine levels you could test with strips during the week and then use the test kit on weekends. Not as good, but probably OK.
The relationship between bromine and chlorine is that bromine is a factor of 2.25 times higher than chlorine. So if you want to add chlorine (say, bleach) to get to a certain bromine level, then divide your desired and current bromine levels by 2.25 to enter into The Pool Calculator to calculate how much bleach to add to get to that bromine level.