As i see it - every single person on the planet falls at a uniquely different point on the spectrum of gender and/or sexual expression/identity - although many would possibly strongly disagree with this...
The spectrum is as large as the entire human race - some six billion or more uniquely different points, and everyone is entitled to relate or identify as they so wish, or so do, as an individual. I dont see that there is, or necessarily should be, a "scale" per se.
Where ever you are at this moment in your life as an individual is exactly where you are with it, no more and no less.
i don't think it should be subject to classification or subjective labeling of any sort, unless you pursue a "clinically" "correct" "course" of some form of transgender "transition", and would therefore need the appropriate professional support and testing to determine this by "acceptable" psychological or psychiatric standards of care for transitioning individuals.
If you are comfortable with your self-expression and desires in this manner, and at this specific point or time in your life, that is strictly your choice as an individual and not appropriately subject to judgement or "classification" by any other, unless you need to find other forms of validation for your situation.
If you consider yourself as a CD(crossdresser) in any form, i believe that this represents that possibility that you posess some, possibly even many "transgender" chracteristics in some way or another, and this seems to have as many differing degrees of intensity of personal expression depending on the individual - again - back to the spectrum and where any individual falls along this quite vast line.
As you said yourself, you seem to have no real strong desire to change your gender, and therefore where you fall along this line is not nearly as deep or intense as many others, myself included, that are deeply compelled to seek greater "self-congruence" via complete (or partial) change of gender identity in this life.
You are where you are at this moment - if this gives you pleasure, satisfaction, comfort, or other form of personal comfort from within yourself, that is only for you to judge, reconcile within yourself, and share with others as you see fit or are able.
As long as you don't pursue a path of choice that tramples on another's rights of freedom of self-expression, or in any way has a destructiveley negative impact on other's lives as you go about your business - it is for you and no one else to decide... There is no scale that i am aware of, and even if there is, i would be strongly inclined to argue against the merits of such, as people change and grow and reach different places within themselves at different times in our lives.
Sincerely,
ChefAnnagirl