When a farmer’s wife vanishes, his desperate hunt reveals he’s actually been abducted and his entire town is a construction, built inside an alien craft to prep them for invasion. He must rescue his wife, pregnant with their hybrid child, and escape back home.

"...he's actually been abducted and his entire town is a construction, built inside an alien craft to prep them for invasion..." - this sounds like the basic premise of Dark City.

It's also unclear what he plans on doing to save the rest of the town if at all.

I'd also change the wording to reduce the length and streamline the plot. e.g:
After aliens abduct his pregnant wife, a farmer discovers their town is a ruse by aliens preparing an invasion, he must then sabotage the alien mothership to save them all.

rescue his wife and then what?

When a farmer's desperate search for his wife dead ends in a realisation that their entire town is an alien prototype--constructed to prep an invasion--he must find a way back home to warn NASA before the real invasion.

In this version, there is no wife to be rescued
He's the one abducted, along with other "sample"
And yeah, the alien prepping for an invasion is a great conflict!