This is an age-old question that no one thus far has been able to find an answer for. As you point out, Netfront won't work because it's written for CE 3.0.
(And changing the OS version in the code, apart from drawing screams of EULA violations by the Netfront folks, won't work anyway.
)
stingraze
(one of our forum members here
) was entertaining the idea of developing a new Web browser for H/PCs, but he hasn't been around this site for a few weeks, so we don't know where that stands.