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Not Node.js per se but a separate project that ran on the Chkara core and worked hard for cross-compatibility would be more than welcome.
A node.js fork where you can optionally swap out v8 for chakra: already baked by none other than microsoft. They hope to merge it back into upstream, that seems possible given the recent history of the Node.js project. Of course, it is very very unlikely that npm modules with native code work in Node.js/Chakra just yet.
I would hope they follow the same path as the jxcore+SpiderMonkey team so I don't have to worry about which engine my npm modules support.