This is a ounces reasons for why yes and why no can carry out this idea:

Why yes:

Both games are very funny, ithful to the original series, the Cover game sounds like a not bad idea, the game can be like the episodie of Family guy when the family be finds with the simpons, the game can be like a Ultimate Custom Night, where you can see characters of Fun Times at Homer's and Five Nights In Pete's saga, me and my team can make sprites and pictures for the game, and i can be a Coder in the game. The idea can be carry out if the creator of Fun Times at Homer's is agree.

Why not:

A bad point is that the both games are maded in diferents code languajes. Five Nights In Pete's has made in ClickTeam Fusion 2.5 and Fun Times at Homer's has made in Game Maker Studio, so, we need to select a langaje to make the game, the creator of Fun Times at Homer's have very work in his games, can be hard have a answer of Nick Person, i need talk with Nick Person about the idea, my game don't have the same popularity like Fun Time at Homer's but the community it's growing up.

Conclusion:

The idea for a Game Cover of Five Nights In Pete's with Fun Times at Homer's can be possible, i need talk with Nick Person if his is agree with the idea, and i just need know if the community is agree with this idea