On Feb 6, 8:02 am, Dox <o.castillo.felis...@gmail.com> wrote:
> show(exp, subs=('bph':\hat{\phi}))

You can set the latex representation of symbols upon their creation.
Does the following do what you want?

sage: var("phihat",latex_name=r"\hat{\phi}")
phihat
sage: latex(phihat^2+2)
\hat{\phi}^{2} + 2

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