Hmm.
a - It's yeast so who cares? Not me. Drink it right out of the bottle. Sierra Nevada has yeast in the bottle. Its good for you...seriously.
b - If you are bottle conditioning - that is naturally carbonating in the bottle - you will ALWAYS have yeast settle to the bottom of the bottle. that is because a short second fermentation occurs inside the bottle to generate the CO2, and that yeast has to end up somewhere.
c - Carbonating in other methods isn't really all that hard or expensive at all. Here's what thos of us who keg do, which is very much like what commercial breweries do:
When the beer is clear in the secondary, and has aged as long as you want, you siphon it into the keg. You seal the keg and chill it. Commercial breweries usually filter their beer before this step, but it isn't necessary.
Once the beer is chilled, it can absorb a lot of CO2. That is, more CO2 dissolves in the liquid if it is cold. So you hook your CO2 tank up to your keg at about 40 PSI and leave it there for a day or so. That carbonates the beer.
When you're ready to pour it, you relive most of the pressure leaving just enough to keep it fizzy and pushing out the tap. A keg is just like one big bottle. So, it probably has some yeast settle to the bottom too. But the cool part is that you pull a half pint or so off and get all the yeast in one go, and the rest of the keg is clear.
Now, if you want to bottle that, you just get a counterpressure bottler. It's just a little gizmo, probably $100 or so and it keeps the beer under pressure while you bottle it. So you pump beer from kegs into bottle under pressure and quickly cap them. It's a two person job and a bit tricky at first, but works great. It's exactly how breweries bottle only on a much smaller scale.
Basically for a couple or few hundred bucks depending what parts you can scrounge up, you can get kegs, tank of CO2, regulator, and, if you like, a counterpressure bottler, anf you're dispensing like the pro's with no yeast worries
Janx