grafting a nectarine (espalier)

Hi,

I have an espaliered nectarine.
It is a simple shape consisting of a single vertical trunk and a series
of horisonlat branches.

Last year I lost a couple of the branches due to a hail storm.

I was hoping that this spring I would see new shoots come from the base
of the original (damaged) branches.
This has not been the case and would like to either graft some new
growth to the trunk with the aim to replace the branch, or if there is
some other way to stimulate new shoots I would be happy to do that.

Can anyone help me.

thanks

james