My method would be, as a twist on the Skirm Scewer strat:
make 2 villagers (however much initial gold stocks permit) build a house or two (depending on initial wood) and then send everyone onto food, age up as quickly as possible with 500 food politician and send 300 wood card. You should probably begin aging up under 2 minutes to get there at about 3.10 or so. This makes it painfully obvious what your doing.. but its the only way to get the time required.
You will need 30 pop for 9 villagers, 8 pikes and 5 Grens (Although, if you can get the grens out building before the 8 pikes, then you will just have 27/20) but I tend to think you should have extra pop room for making more grenadiers as time permits. But.. in terms of pure efficiency it might not be worth it.
So at age up stick everyone onto gold after collecting 100 extra food and send one villager to forward build the artillery range. Queue 5 grens and then send the pikeshipment as soon as possible. Split once you have 600 food/300 gold probably to 5 on food 4 on gold.
Even at this speed, you probably wont be hitting them before 5.30-6, and that FF upgrade will likely have been hit. However if you quickly kill a house, drive everyone inside the TC and he cannot call militia for resource constraints, then you should bring his TC down with 8 pikemen, 5 grenadiers.
For an extra twist, you might want to send your minutemen along. 150 food and gold may well be in your grasp and while they shall have low health (if any), 6 firing at once packs a reasonable punch on villagers and minutemen alike.
The obvious problem with this is its very obvious what your doing. However if you age up with a normal 4 minute build, you wont hit his town untill 6.30+ and at that point he will be very close to fortress age if its a traditional FF. If you delay for a second batch of Grens the same is true.