What the OP needs to do is put the platform pedals BACK on the bike and practice how to come to a stop properly with those.

If you feel you need to stand up from the saddle rather than slide forward from it when coming to a stop, or you simply place your feet on the ground while sitting on the saddle, you have it set WAY too low.

When coming to a stop, slide forward from the saddle with your weight on the foot that will remain on the pedal, balancing the bike to the opposite side.

Then when crawling towards the stop, rather than keep your foot on the pedal until the last possible moment, take your foot off of the pedal and hover your foot over the ground.

When you learn to stop like that then clipless will be a cinch.

Oh, and with clipless always unclip at the TOP of the pedal stroke when you can, at least when you're still learning. It's a lot easier. The position of the cleat has nothing to do with where you unclip, and everything to do with the position of the ball of your foot over the pedal during the pedal stroke.