I like it! Bombs are a little trickier to do, of course - harder to smuggle than a pill or needle. But there’s no reason you couldn’t have both Suicide Zombies and Improvised Zombie Devices.
Bah. We solved this problem years ago.
We managed to aim a rocket at Mars, load it with a Roverwrapped up in an airbag, and launch. Twice.
And forget human zombies. Zombie kittens and puppies, fired into the heart of your enemies territory.
How contagious is the zombie infectious agent? And how stable is it outside a “living” host? ‘Cause I’m thinkin’… zombie slurry. In water supplies, aquifers, etc.
Set up dart guns full of zombie blood. Then shoot some enemy troops. Place beartraps with zombie blood on the teeth in chokepoints. Force the enemy into block fighting and narrow passages.
What kind of conflict are you facing? Is this country you wish to overthrow without a large land army. Or are you thinking of using zombies as a complement to your standard forces.
I think the former would be best accomplished by deploying zombies in squads of 2-3 in as many locations as you can reach. Maximize the exposure to enemy.
If you’re facing a traditional land/air battle I would suggest they be delivered in several platoon size elements to your enemies rear areas. Wooden glider would be best. Remote piloting as previously suggested would be a good idea. You really don’t want zombies up against modern infantry and certainly not armor or artillery. With the rates of fire and explosive rounds even a brigade of zombies would be a total waste in a frontal assault against a battalion of infantry that can call in air and artillery strikes.