Another option is to get a bigger card and stick with ProRes HQ. The Kingston Canvas React 128 GB works in the Video Assist (I've tested) and is very cheap (about $30).
Kingston Digital 128GB SDXC Class 10 SD UHS-I100MB/s R 80MB/s W Flash Memory High Speed SD Card SDR/128GB
This is the one you want. They make even larger-capacity ones, up to 512 gb, but I haven't seen reports from tests of those so you'd be taking your chances. Many people have reported success with the 128 gig cards (and failure with lower-capacity ones).