[QUOTE]Is this possible in an F35b?[/QUOTE
In a word, no.
The articulated engine jetpipe swivels fully down from fully aft and could therefore provide thrust at any angle, although I don't know if there are specific stops that limit the pilots options. However, it's a bit academic as the forward lift fan only provides vertical thrust and cannot be vectored thus preventing such a nose high hover climb.
In the current climate if it were physically possible I'd expect the software to be programmed to prevent it anyway.