Shemsu, it's not a problem at all – it only takes a few seconds for me to resize these things, and I'd much rather end up with something people will find useful.
Anyway, I've played around with the banners a bit more - as requested I've done some smaller versions of both placeables and scaled down the holdable one. The smaller placeable is pretty much the same size as the holdable so could be carried and planted in the ground with scripting as the Amethyst Dragon suggested. Also did a much smaller version of the holdable one for those adventurers shamefully lacking the upper body strength to lug around a massive great banner with a huge weight at the top all day.
So in the above shot, 2 large placeable banners, 2 smaller placeable banners, 2 holdable banners.
And for those among you who want to show the world how much you love the snake cult but worry that marching off to battle waving a big flag around will just make the other soldiers laugh at you, this next item is for you...
Stylish and practical!