Using populate("*.dll", "C:/Program Files/VSTPlugins/") with filebutton not working

Hello, it appears VST loading using the vst4cs opcodes is no longer supported. Is there any other way I can create a VST that loads other Cabbage instruments I have already created in some kind of effects rack (either packaging the code of one .csd into another, packaging the audio processing code of a .csd as a UDO, or loading/launching an existing plugin inside another plugin as a .csd rather than as a .dll)?