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.
A strategic reserve would give the US government the power to determine the price of Bitcoin. They could make the price go up by buying it, and make the price go down by selling it.
A strategic reserve! They directly or indirectly hold the largest reseve of Bitcoin by a nation. They as in the government has been pumping the price of Bitcoin. It is evident on how Bitcoin created new ATH after Trump was declared as the next 47th President of the country. There is nothing hidden or secret about thier policy. What we need to see whether Trump fulfills his promise and makes Bitcoin as a reserve bigger than Gold.
That's what you want? Seriously? Are you mad?
Take a chill pill due as what OP understand now has already happened. I am not sure when the BRICS country come up with thier own reserve. Whenever they come it will not be bigger that the US for sure.