I'm an OFP zealot! My main general strategies (apart from doing yoga and getting chiro adjustments) are to keep my knees lower than my butt at all times (so no soft chairs, couches, bucket seats in cars, etc) and to sleep on my left side as much as possible toward the end. Pelvic tilts and squats are useful too, though these fall under the "yoga" umbrella for me. My babies have always been vertex and anterior, though I think both tended to be ROA (right occiput anterior) instead of the optimal LOA (so facing slightly toward my right rather than my left), though it hasn't really posed a problem during labor (apart, I suspect, from the long delay between SROM and contractions beginning with #1--apparently this pattern can be a sign of ROA positioning).
As you said, though, there's only so much one can do to achieve specific positioning. Sometimes there are reasons why babies present breech or posterior (like short cords or entanglements or whatever), so all we can do is try to maximize our chances of getting things in the right position (and I see soooo many pregnant women lounging around in armchairs or recliners--there's a reason they say that the living room couch is responsible for a lot of c/sections these days!).