Yeah but the only reason those supplies and services aren't available in the US is because China has all the manufacturing scale. It's not as if China is the only country that can make silicone.
If trump keeps to these tarrifs and importing silicone becomes too expensive then someone will open a factory to produce it here. Same with small scale molding. If there is truly a demand for something the market will find a way to produce it.
It may be more expensive because of higher labor standards, wages and environmental standards, but that just means it's getting closer to the true cost of the product, instead of the one subsidized by environmental destruction and labor exploitation.
Small capital is still capital and relies on labor exploitation. If your talking about manufacturing wages globally then you should be talking about that SBOs income globally too which would put them in the top 1%. If there were no labor exploitation and the revenue from the sale of the products were split evenly among the laborers the SBO would be payed far less and the manufacturing workers in China would be paid far more.