you might want to check out carla[0], it's difficult to find when looking up vst hosts, you have to get past a couple "unbiased" top 5 list sites & outdated ones without vst3 support still being recommended, but it's the one that's brought me the least issues (expect one or two crashes setting it up anyway). seems it's made for linux first but i've had no (big) issues running it on windows so far. you will need to download third party vsts for every effect fl studio usually implements out of the box
[0] https://github.com/falkTX/Carla/