If I understand the question. Yes. Just look at what the assetlibrary is doing and take it from there. I did something similar to what you are asking. The asset library is good. I just didn’t want two resourcemanagers in my project.
All the parser classes are publicly available. though you might run into namespace issues if you are using external libs.
away3d.loaders.parsers.*
var _parser : ParserBase = new ObjParser();
_parser.parseAsync( data, 100 );
thats from the top of my head.
Ohh and you still have to listen to parse events.