Gelatin won't touch pectin haze. Pectinaise will break down the pectin and allow it to settle to the bottom of the carboy. Gelatin is great for particulates and yeast, but it unfortunately won't do anything for you if it is pectin haze.
I would dissolve the pectinaise in some distilled water or a little cider (if you have a wine thief), and then carefully add it back to the main volume. No need to rack it. If you're concerned about oxidation, you can dissolve it in club soda. Hopefully you won't get a volcano, but there should be enough residual CO2 coming out of the club soda after it's dissolved to purge whatever oxygen may have entered the headspace.