Actually, forcing third world farmers to compete internationally on the global market is what bankrupts them and pushes them into financial slavery. They do just fine without industrialized machines otherwise.
Oh, you're scrounging for rags and ash to catch period blood? I have a machine here you can buy that will let you make napkins from tree bark. I'll even show you how to use it. That's not a subsidy, and it is very much improving the technology at their disposal in a very intentionally iterative way. This isn't a subsidy.
The same goes for teaching farmers sustainable practices. Much of the developing world's issues with hunger are due to poor land management, not a lack of technology. Buffer zones to prevent erosion and good irrigation need to be subsidized in the short term, but in the long term they're going to be self-sustaining.
In general, you're talking about this as if it's a straight giveaway. It's not. It's coming in and saying "you are having health issues/money issues/food issues because you are doing x, y, and z wrong. Here's how you can do it better." Some technology is definitely helpful. But western-style factory farming isn't the obvious solution for subsistence farmers, not by a long shot.
Yes. When the west was developing industrialization, for example, we heavily subsidized burgeoning industry (and still do).