I'd sort of like to know how to measure such small amounts of ingredients. I use a scale, but it certainly doesn't measure anything very small.
Is there a good scale available that will measure very tiny amounts, or maybe even percentages?
If you can measure to 0.1g resolution, it is easy to measure to 0.01g resolution or even better.
Dissolve 1.0 g yeast in 99.0g water then use 2.0g of the resulting mixture and you will have 0.02g yeast (+/- 0.001g). Don't forget to reduce your formula water by the amount of your water here - in this case 2g. The math is easily adjusted for other amounts.
If you can only measure to 1g resolution, the method above could have an error as much as +/- 0.01g. In this case, you might want to look into a better scale. A scale such as this one: http://www.amazon.com/American-Weigh-AMW-2000-Digital-Jewelry/dp/B000OIRSSU
You could still do it with a scale that only had 1.0g resolution, but I would probably go bigger with my measurements to minimize the effect of measurement error – something like 5g yeast dissolved in 1245g water and use 5g of the resulting mixture. That would reduce your measurement error to +/- 0.002g
If I was doing any of this, I would hold back a little of my formula water to use to rinse the container that held my yeast mixture into the dough to be sure I didn't leave any yeast behind. You are not adding much yeast and I wouldn't want to miss any.
I would probably not recommend starting this small.
If you do go with a reloading scale, it will measure in grains not grams. 1 gram = 15.4 grains.