Batch-convert multiple activities at once (from Type A to Type B)

So Garmin has recently introduced a lot of new activities. Great! For years, I have logged my Badminton activities under a different activity-type, as there was no Badminton activity available. Now there is a Badminton activity, but I really don't feel like going through hundreds of activities manually to change them all to Badminton.

So: Is there any way select a lot of activities, and kind of batch-convert them all into a different activity type?