Well folks, I somehow got I subscribed from my own thread, so I missed out on a lot of good advise. However, here is what I went with...
I managed to find the guinea 'Tanzania' seed at a greatly discounted price through a promotion with a local Nestle 'lechera'. Instead of RD$455/lb, I paid about RD$245/lb for 55lbs (25kg). From research I did on Guinea seed, that was more than enough to cover 100 tareas (about 0.5 lb / tarea would have been plenty, theoretically.
I decided to use the colin and bottle method, where the workers stab/slice the ground then sprinkle seed mixed with sand via holes in the water bottle lids. This method proved to be VERY time consuming. I had 5 Haitan workers going all day and they barely got 1/2 of one of three fields done! Also, with out my knowledge they made the holes much larger, so that instead of a few seeds being sown at once, maybe 20-30 were being poured into each 'slice'. :S They blew through the 1st of 3 bags with such little ground covered... I was fairly disappointed.
So, the next day I gave up on 'planting' and went with spreading by throwing the seed ... and I instructed the workers that the bag had to last for the entire pasture section. Well, that didn't work well, either, in terms of how much seed was used per tarea. Without doing it myself, it was very hard to control the amounts used. I think I only got about 1/2 the amount of coverage I was hoping for AT BEST.
Well, US$300+ in seed and very little coverage + cost of labour... Kinda left a bad taste in my mouth... But at least I'll know better for next time. Like a previous poster mentioned... It IS hard for a gringo to 'work land' around here! (And I would add... much more costly, too!)