By objective duties do you mean actually objective (as in, within the fabric of the universe or reality, something totally independent of the observer) as that is what I find objective to mean. Anything else is subjective. If you don't think the is-ought problem can be bridged, I'm confused how you argue the existence of objective duties (and thus an objective morality, if I understand you correctly).

I do agree freedom is a decent word for the concept your describing, but is there nothing else that can be used (e.g. mental freedom, desire freedom/freedom of desires, moral freedom)? I think these would help distinguish it from the regular use of freedom, because you may get a lot of flack from ordinary language philosophers for this usage. I don't think it makes your actual argument weaker, but I do think it weakens your ability to communicate it effectively.

I agree that there is subjective meaning, if what you mean by that is something like this: purpose, or meaning within the world is an arbitrary/human concept, and thus can be nothing else than subjective.

I apologize for using the term glorification, as I don't think you're glorifying freedom any more than utilitarian's glorify utility or virtue ethicists glorify virtues. Maybe "moralize" is a better word, but the "moralization" of some concept is integral to any normative theory. In any case, it isn't an issue, but I was just trying to show that freedom is no more special than utility or virtue in regards to the creation of an ethical theory.