If you feel so close to the Rav that you will be hurt enough by his lack of attendance to blog your complaints about it, why wouldn’t you feel close enough to ask him to be mesader kiddushin? What hold do you have on him, and how close are you really, if by accepting your invitation he will only be playing second fiddle anyway? If the choice of siddur kiddushin is not yours (or if it’s a simcha that is not a wedding) then ask him if he will honor you by speaking at your simcha, or offer him a different kibbud in advance of the event.
The way to get your Rav to show up is to be mechabed him. If you just invite him to the party like any Joe Shmoe then he has as much right to decline as any Joe Shmoe.