Ginger precipitation
Can you not simply infuse your alcohol with ginger? Its slower, but effective. It doubles as a way to store fresh ginger.

If I'm peeling some ginger, I'm peeling an entire "thumb" of ginger and storing the peeled slices in vodka in a mason jar. The ginger keeps for at least 2 months, though it's never been around for that long. I read about the technique from Fine Cooking.

After a few weeks to a month, I have ginger-infused vodka.