How can I do a fast turn while using inverted breaststroke?

I am several seconds faster in a backstroke race doing inverted breaststroke than doing an inverted crawl stroke, but I am terrible at making a turn at the wall. Should I flip over on my stomach and do a tumble turn as I approach the wall? Would this violate any rules? Any ideas would be appreciated. As Allen suggested, I would try to get into normal backstroke a bit before needing to flip. If that doesn't work for you, try to get someone (coach, stroke judge, experienced backstroker) to watch you turn using your inverted breaststroke to make sure you're doing your flip turns by the book. I'm sure the backstroke flip turn rules were written with normal backstroke in mind. Also, if a flip turn doesn't work for you, remember that you need not touch with both hands. You might be able to develop a much faster open turn by rotating 90 degrees and touching with just your underwater hand.

I am several seconds faster in a backstroke race doing inverted breaststroke than doing an inverted crawl stroke, but I am terrible at making a turn at the wall. Should I flip over on my stomach and do a tumble turn as I approach the wall? Would this violate any rules? Any ideas would be appreciated. As Allen suggested, I would try to get into normal backstroke a bit before needing to flip. If that doesn't work for you, try to get someone (coach, stroke judge, experienced backstroker) to watch you turn using your inverted breaststroke to make sure you're doing your flip turns by the book. I'm sure the backstroke flip turn rules were written with normal backstroke in mind. Also, if a flip turn doesn't work for you, remember that you need not touch with both hands. You might be able to develop a much faster open turn by rotating 90 degrees and touching with just your underwater hand.