Hi! Welcome to Dakka!
As someone who's played Imperial Guard for a while, I've gotta say, while the Wyvern can certainly help make enemies if you REALLY wanna make enemies, look no further than the forge world heavy artillery carriage. Get some 1/35 Trumpeter 15cm guns, 24 guardsmen, and an aegis defense line and watch as people learn to fear earthshaker cannons that can accept orders.