So I have a chance to buy G25 pedals for like 20€.

Would they work with my Momo perfectly as the connector looks same as one on the Momo's pedals?

I would like to use that clutch

I would say probably not, although i don't know for definate.
But if you have a gameport, they would be worth the 20€, as with a little jiggery pokery you could get them to work with it.