Not really possible. Even amateur fireworks manufacture is so expensive, in terms of permits, storage, storage inspections, etc. here in the USA, that professional manufacture of fireworks is not a cost effective process, unless you are talking the expensive stuff for cities and rich theme parks.
IMO, your only real hope is finding a non-Chinese Asian manufacturer. Many places, like Vietnam, but they are also a communist country, and in the end, would very likely perform pretty much like the CCP if put in a bind.
I am not convinced Covid19 was a intentional release. But whatever happened was made much worse by the CCP’s performance.
Look at Chernobyl and the Russian Communists. Communists are communists, through and through, and they are so hung up on their own infallibility and power, they can’t ever admit to be mistaken or wrong. Chernobyl was an accumulation of DECADES of mistakes in nuclear reactor design. And then cover-ups of the design failures, till tthey had a design failure so catastrophic, it couldn’t be covered up!
And just for kicks, try to imagine the current left having a Chernobyl event. Think about how they act about minor things. Now extend that to a environment killing event like Chernobyl.
Yes, they will act just like communists of yore. Never their fault! Never caused by their mistakes of hubris!