Sorry, but there's a difference between creative workarounds and hopeless dead ends.
The approach you describe is a hopeless dead end:
1. missions can be interrupted immediately by a research trigger (OXCE only), but cannot be restarted... the only way for them to respawn would be a random chance at month end
2. the classic mission table system does not support research triggers at all... if you wanted to use them, you would have to write a completely new mission system using mission scripts without a mission table... and just FYI, even though missions scripts based on execution chances and research triggers are a powerful tool, they are not able to replicate the vanilla mission table based approach
3. there are no bigger UFOs than very large
4. the effect of UFO sizes on the detection chances is hardcoded (=not moddable) and practically negligible when increasing size of the UFO "by one"
There is no wild strategy out there that would achieve what Kzer-Za wants.
PS: In the next OXCE version, Yankes will add UFO detection scripts... but I don't know if they will be able to access all the necessary information (e.g. discovered research table or UFO's mission).