If you can handle a commandline, VLC is a free and robust tool to join clips before starting a Virb Edit project. See Action Cam Data Overlay - what is the best setup for creating race recap vids? - #17 by gcarver
As a bonus, it greatly helps synchronizing the data to the video because you only have to do it once, instead of over and over for each part.
Definitely a shame these tools appear to have stagnated.