Hey,
I've just received the Dr. Hadriex Hell Cruise Mission. I think I'm pretty well prepared for it. Unfortunately, I haven't finished researching and building a ghost tank, yet. Too bad, because it's a one-off mission.
So I'm thinking it shouldn't be too cheaty to simply erase the mission from my save, wait until the building is done, and then re-insert the mission into my save.
I've just tested this and it seems to work. Transferred the entire entry from 'missionSites:' over to another save and it shows up on the geoscape and it is playable.
But could there be any unforeseen side-effects? There are other entries for 'DR_HADRIEX_CRUISE' in the save, that I have simply ignored for now, since I don't know what they do.
Can I go ahead with my plan?
Edit: Well, I came up with a different solution. Simply modifying the despawn timer also did the trick and I don't expect any side-effects from that.
Still, the root of my question remains interesting. Can active missions simply be transferred between saves, without weird things happening?