I recognise those balloons..!
I was just trying to help
@krissboo who was getting very high balloons when using my 'vintage balloons' config, but yes, another solution would be to copy the balloon path into your existing config. The 'modern' balloon kn5s could then be deleted from the track folder.
Edit:
One extra thought: would having such a low track datum affect things like 3D cloud positions (new Sol/CSP feature)? I guess it depends if the cloud coordinates are absolute or relative to the track.