[Kieck]

I think we need a better identification on the wasps in question, first.

"German wasps" sound like German yellowjackets to me, Vespula germanica. These will enter beehives, and may steal some honey late in the season, but usually seem to cause little enough damage around here that they aren't worth bothering.

"European hornets" are hornets, Vespa crabro, which are much larger than yellowjackets. I have no experience with them (they do not live around here yet), but understand they will raid honey bee hives at times.

The videos circulating on the Internet of hornets attacking honey bee colonies are mostly of Asian giant hornets, Vespa mandarinia, in southeast Asia.

If the wasps in your situation are just wandering into the hive and the bees are not reacting defensively, they probably aren't taking enough to cause the bees any alarm.

 

[Kieck]

I don't recommend using the Frontline-in-meat tactic. Such use is really only intended as emergency use in extreme situations, not just to rid areas of yellowjackets.

Yellowjackets are beneficial insects, despite the inconvience they give to many beekeepers. They are predatory insects, and kill large numbers of pests. They also fill vital roles in ecosystems.

"Bee wolves" are even less of a problem. The number of bees that they would kill around a hive would have no effect on a colony.

Just because a predatory insect may eat a few bees, don't assume that all predators need to be exterminated.