Then why not just have the janitor deliver it? Or a Muslim? Or anybody at all?
What you're asking for is a speech, as the beliefs of Jews and Christians are completely exclusive.
I don't have a problem with respecting the opinions of Jews who happen to be present, but to ask the Christian to pray in something other than Christ's name is ridiculous.
That concession would be insulting to anyone with any, real religious values at all. It's better not to have the prayer in the first place if it requires dishonesty on the part of the minister.
What do you think about the exclusion of atheists in the legislature?
Regards,
Lev