Father,
Yes, I agree. There are some garments that could possibly be used as presbyterial stoles as well as diaconal stoles.
However, the ones used in our parishes are tailored for their specific use and would just look wrong if used for other purposes.
The point I was trying to make was that all deacons pick their vestments from the same closet. Married, single, transitional, permanent, whatever and whatever else, a deacon is a deacon.
A deacon may (or may not) later become a priest or, for that matter, a deacon may later become the Bishop of Rome. Right now, he is a deacon.
Shalom,
Memo