Bike shoes or running shoes on bike in sprint

Hi!  I did a sprint tri 2 years ago before I had clipless pedals so obviously wore my running shoes for the bike portion.

I'm doing my second sprint tri on July 25th and am debating between changing shoes or using my running shoes for both the bike and run.  I have reversible pedals on my hybrid (platform on one side, clipless on the other) that I would have to take off and add to my road bike, since my road bike's clipless don't have a platform.

I am completely comfortable with the clipless pedals except when it comes to mounting - I have to come to a complete stop, make sure the left pedal is all the way down, clip my foot in, bring it up to about 2 o'clock and then start going.  Wondering if just hopping on and going in my running shoes would be easier, and then I wouldn't have to change shoes later.  I am pretty much BOP so a few seconds isn't going to make a difference but curious to see what you all prefer.