Assuming this plan goes well, I want to propose our original idea again (as well as tweak any improvements we can think of).
The original plan being: intentionally leak that Leaf is gathering its Summoners to attack Rock itself (now that we have established how powerful our Summoner Collective is), forcing them to meet it head on in advance to stop the invasion. Then, after the army is nearly depleted, reverse summon out and bombard the area with everything we've got, then send in the Narutos + Jonins + sensors for clean up.
If Asuma is still worried about keeping Leaf guarded, he can stay behind with one of the Sannin while the other attends and makes sure the Summon group doesn't get instantly flattened
I...don't know how to put it, so let's preface it with this: I find the idea interesting and insightful, and this is not a feedback for you in particular, but for a general trend of the hivemind(One from which i am not immune from) on this plan.
This is my biggest concern with the plan: i have the distinct(Possibly false) impression we are being taken captive by the allure of a shiny new interesting mission, full of explosion,Mastermind!Hazou and
consequences to the point of ignoring the problems it could bring.
For example, the fact we would put our family (Keiko,Noburi,Hazou) in possibly the most dangerous role is...not being ignored, but not being given the weight it deserves in my opinion. Yes they can retreat to the 7th Path and are not in the frontlines. But everyone has a plan until they get kicked in the face. I feel the "Oh well, 7th Path retreat" doesn't address the
entirety of Rock trying to kill them. It means a lot of secret techniques and contigenties, Clan secrets, Bloodlines, thinker Clans, ect...
It also has more important,long-term consequences, such as putting Keiko,Noburi and Hazou on
"Personalized Kill-Team" list for every village, arguably even more than a Jinchuuriki, as Naruto is an S-ranker that requires an equal force to kill. This doesn't mean we shouldn't do it, but i don't see any careful consideration on the long and short term pro and con of such action.
Also starting an all out race for other summon scrolls with our leads still open and not addressed.
There are other considerations to make about it and we should careful discuss those before starting the fuse on this grenade,imho.
I like the plan, i'm one of the people that noted the potential of the Summoning Army, but using Summoners as bait is not a light choice, nor it is assaulting Rock in front of the world with such power.
TL;DR Shikaku is right, follow Shikaku's "Think carefully because flipping the table" advice.