Assuming the translated gut flora to be the cause of your improvement then I'd look at two things. What bacteria the beneficial transplant contains, you can have it assayed (I believe it's called a bacterial culture test) and then find a cheaper source for that bacteria. Two, what the diet of the donor is, so you can try to replicate the beneficial environment in which those particular bacteria flourish.

AIUI, your own bacterial flora are in competition with the transplant. So, I wonder if a doctor would prescribe antibiotics (or something else) to wipe out your own flora, then the new flora (possibly with a diet change) would have a greater chance of taking hold?

I wonder also if the causal flow is different here, that there's maybe an underlying condition that is causing the gut flora to not prosper (like making an excessively acid environment).