I believe we should focus on nailing down an idea of your hedge tradition first. Defining it story-wise and mechanically before proceeding.
We need a name, a sense of their teachings/culture and origins, and what kind of magic they study/produce.
It seems like you would like to make the Obfuscation Magic a significant element of the whole tradition rather than something that your character in particular is good at? Or a bit of both?
Since this came up recently for someone else making a tradition I'll copy directly what I asked them.
Re: Tradition Major Virtue
I will give this some thought. However I strongly prefer that such a selection be reflective of the culture and magic of the tradition, so it will help direct this choice to fill in the story material regarding the tradition first.
Re: Tradition Minor Virtue
I tentatively suggest Sensory Magic (HoH: MC, pg 27), as it could be rather useful in engaging in deception/obfuscation I think. It would also lend itself to a more Druidic/Bardic type of magical culture in various ways.
Re: Watching Spells
Very briefly ... the 5e guidelines don't explicitly require a ritual for such effects in the guideline. But the only example spell we have of such effects is a ritual. And people argue about what this means. I lean more towards the side that if the guideline doesn't explicitly say Ritual (as many do) then a Ritual isn't required. And the subsequent material such as that referenced with Virgilians then is in error based on assumptions carried over from past editions.