I have never drip acclimated an anemone and never lost an anemone secondary to not drip acclimating. Put anemone in container, slowly switch out store water for display water over the course of a half hour.
This is my third post in this thread, neither of my first two post were even acknowledged or answered. I am not even certain that was a BTA based on the images. You obviously have other anemones and are keeping them successfully, so your doing something right.
Use a conversion chart to assist with alkalinity values, just insert ppm and the chart will convert to what ever measurement you prefer, such as dkh.
https://www.hamzasreef.com/Contents/Calculators/AlkConversion.php
I suggest putting up the money for a Hanna Checker.