So in other words, you want the US to use taxpayer money to buy enough Bitcoin in order to manipulate the price of Bitcoin--in the same way the US has a strategic reserve of oil that they sell off when the price of gas gets too high.
Please do not be so dramat, the US is using ETFs to do what you are assuming. It has been already done and it is working for them.
ETFs are bought by individual US citizens voluntarily. The reserve is about using compelled taxpayer money to pump the price of Bitcoin artificially. Completely different.