Should McLaren use 2014 chassis with 2015 nosecone until rest of season?

McLaren this year are awful because of transition period from Mercedes-Benz to Honda. McLaren this year's MP4-30 also flop because several pointless including Jenson Button at Monaco 2015

What, I ask, was McLaren doing DURING THE OFF-SEASON! They didn't just happen to switch from Mercedes to Honda and how much longer will Jenson, and Alonso have to stand there with fixed smiles, post-race, saying the upgrades are coming in… So not!

My immediate thought seeing Alonso's car staked up above the Ferrari after that crash yesterday, was that's the right place for the car - top of a heap of junk. Glad Alonso was okay however. Kimi too.

Should they? Nope. They wouldn't be able to, this new engine wouldn't fit.