They sound kind of ideal.
It's a sort of introduce the spores and come back a while later.
If it takes, then the tree will produce multiple fruiting bodies, and once it starts then those will get bigger year after year.
If the situation is ideal they can be worth harvesting within a year, but sometimes three is a better bet.
To be perfectly honest, even amongst wind damaged trees, I wouldn't introduce the fungus unless it is already in the area.
It can literally devastate a woodland. Thing is though that birch is a pioneer species and will survive despite the fungus, but the fungus will grow on other trees too. Beech, oak, cherry, lime, poplar, alder, sycamore and even on pine.
I would recommend that you be very sure you're not causing problems in the years to come by introducing it somewhere.
cheers,