Why use a 1.5" wand on a presumably high airflow system using 2" hose? You're choking it!
If this is your main wand, well worth getting a full 2" bore wand, you can feel it breathe so much easier.
Aside from that suggestion, I do still use a 1.5" wand now and again. I did today actually, awkward narrow traffic lanes upstairs in a small house, for which it is perfect.
I use a 5ft length of 1.5" whip hose, it has a normal 1.5" cuff at the front end which accommodates both the 1.5" wand and also the hand tool and stair tools too. My main 2" hose has a coolcuff on the end. The "rearwards" end of my whip hose has the coolcuff 2" to 1.5" reducer which simply screws on the the coolcuff at the end of the main 2" hose.
Oh b*gger, this is starting to sound complicated

But it isn't it's really simple, if you want I'll take a photo of it tomorrow.