I've got a problem with changing this sentence into passive :
We hope they will send us an invitation

Can I change it into personal construction?
They are hoped to send us an invitation.

We is a problem here. It isn't hoped in general by people. It is a quite specific personal hope because "We hope".

I know I can say:
We hope to be sent an invitation
And probably:
We hope taht an invitation will be sent to us.

But what about the personal construction?