Years ago with photinia, roses and grapes I did a mass project for tafe, and got better strike rates with really dark iron bark honey, than with the standard supermarket "rootex" powder.
Not a lot, but around 10-20% better from memory, photinia was around 30% better.
But with willow, poplars and something else I cant remember, I ended up with a lot less successes, than the control(nothing) or the powder. Really crappy for the water loving stuff, but its always super easy anyway.
Using that cheap squirt bottle honey(has glucose it as well as honey and water) I just got loads of black mildew in a bout half of them, but it could have been spread from the roses.
I just dipped about 1inch in the honey, left it for 10-20mins, wiped it off with a finger and stuck it in the soil.
When I strike new stuff these days I generally use honey on half and powder on the others and it averages out to pretty much the same results.
Generally a very slightly better strike, but then slightly more fungal stuff, so?
Who knows. I still cant decide which is best over all myself.
With HBWR, burning the stem a little with a cigarette lighter, just a little till the grey green changes, then burying it can help them root, where I have had just about no success with any other methods. Takes a month or 2, but like I say, bugger all success with them using powder or honey, or even cut and bury.
Its a similar sort of plant, so that might be worth a try too?