I never have liked or used a "balloon ascension." It is a novelty, it seems too gimmicky to me, and I think people would remember the gimmick more than the point it's supposed to make or the rest of the service itself.
Some churches still keep the Feast on the 40th day after Easter. . . .
We did last night; we celebrated the Ascension of Our Lord. In the parishes I've served where Ascension service on the 40th day (always a Thursday) had fallen by the wayside--likewise, Epiphany service on January 6, regardless of the day of the week--I have tried to restore those major festivals to being observed, on the proper days. We usually don't get great attendance, but so what.
When you push Epiphany and Ascension to the following Sunday, then you lose the distinctives of that Sunday.
BTTT for Ascension Day AD 2008