We have a variety of native plugins built with JNI, like zip and bit plugins. We are using them in Corona without any problems. Would you consider building yourself a binary libimagequant with older NDK as a native plugin? Like, you can make it work right now, without waiting for us to make arm64 binaries for you, and it would be any time soon. Would you like help with that?
You have several ways of solving your issue, and waiting for arm64 binaries would be by far the slowest one, I can’t even promise we would deliver arm64 just for you in next month.
P.S. to be honest, I won’t promise that we even would do it.