I believe the best procedure is actually sticking it in your nose.
(They run a tube through your nose, down your throat, through the stomach to the top of the intestines, and introduce the bacterial slurry there.)
Makes you wonder how hard would it be to just put it in a swallowable capsule that dissolves only in the upper intestine.
Also, "fecal transplant" is marketable only to weirdos. "Probiotic infusion" would work better.
For those who want to gain some artistic talent, there's this (but is expensive):
Pretty sure there’s a shorter path to the top of the intestines than through the nose but I’m no Biologist.
That's a fairly invasive way of doing it. It can be given through pills now. https://www.lhscri.ca/news/innovative-poop-pills-show-promis...