How about to organize av false positive contest. Competitors creates harmless programs. If your program got most false positives from AVs, you won!
If people see many open source harmless programs are detected as virus by AVs, they might stop worrying about Nim's AV problem. Or AV vender might try to improve their product to reduce a number of false positives. Recently, MS defender detected files in MinGW64 GCC from msys2: <https://github.com/msys2/MINGW-packages/issues/10295> Not only files in Nim but also files in GCC can be detected by AV and Nim uses GCC in default. It seems any native code executable files not used by a lot of people can be detected as virus by AVs.