There is support for hvmath (a virtual unicode font is constructed
then)
but you need to get those files somewhere.
An alternative is to roll out your own virtual math font (take a
look at
the *.lfg files that have math in their name).
On the agenda for the tex gyre project is a serif math font (lato or
so)
but that will take a while (also awaits funding).
The font fallback mechanism is another alternative but one shouldn’t
expect too much because a real sans serif math is necessary to get
larger operators.