I LOVE yoda, but speaking the truth...
Unfortunetely, Dooku fighting Yoda with ANY other jedi or sith, good or lame, would probably win. Think about it, all that has to happen is Dooku shoots his lightning at Yoda, and while Yoda is tied up blocking it with his hands or saber, the second guy comes in for the kill. I suppose Yoda could try to redirect the lightning to the second guy, but I would imagine anyone would be able to get the kill shot with Dooku tying up Yoda like that.
However, I must say that Dooku certainly isn't an even fight with Yoda. Yoda in AOTC could have beaten dooku quite handily if he wanted to, and if he didn't have to protect the limbless and beaten up little kids on the floor (obi and Anakin) Dooku fled like a little b1tch after about 1 minute, because he knew he was totally out classed, and if he stayed, he would have been deader then dead.