Ok here is my input for ya. I did ghandruk trip in around November, and it was pretty ok. I think it should be ok if you do ghandruk trip after month or so. It takes around 5 6 hours to go and same or less to come down, so if you take 2 days trip into account it should be fine for ya. As for paragliding, I have not done myself yet, but from what I have heard from the friends who have done it, it is ok for first 5 mins but it gets boring after that. They normally have half hour paragliding there. so take this into account.
Cheers for your trip and paragliding. hope u enjoy it both.