You could try using a fine net to catch the particles of dip out.
As you suggested it might be a good time to reset the tank anyway. I would set up a temporary container with RO and salts to approx the same parameters as your tank, making sure temperature is about the same. Then use the new water to drip acclimate your shrimp over 6 hours or so to the new water, then move the shrimp into the temporary container. Then reset your tank. If parameters are as simialr as possible, losses should be minimal, even for new shrimplets. At least far fewer than if there is an ammonia spike in your tank.