How Shikaku's plan could work using Naruto Bunshins.
Naruto can't make bunshins in Kyuubi form. HOWEVER, there may still be a way he can make bunshins and use the Kyuubi form.
Suppose Naruto makes the Shadow clones in his normal form? THEN has them transform into Kyuubi mode? We've seen Shadow clones transform into the Kyuubi once before.
It was a bunshin. Hence the poof on the last page.
The Hachibi told Naruto not to make Kage Bunshin's WHILE in that form, because for every clone he makes, the Nine Tails would be absorbing a portion of Naruto's chakra (see link below).
However, if Naruto has already made the clones before entering Kyuubi Mode, they could just transform after. The clones would just have to be careful not to make bunshins after they transform (clones can also use jutsu), but it probably would just make them disperse.
So Shikaku's plan could work...Theoretically. It may still pose a problem. Who knows?