Sorry about the rubbish ipad photo (and unfinished minis), but it does the job.
Because they're plastic, it's fairly easy (so long as you have the right bits) to convert them by just making cuts around the wrist, and supplementing in the right parts. I added a Palace Guard speartip to the to of the banner to make it fit in better.
It does, however, hinge on you having spare parts. The banner is taken from the Fireforge Games knights templar set, and the Horn is from the Warlord Games Imperial Romans. If you dont have anything to spare, you could drill a hole in one of the hands and use a length of thin rod, with some paper for the banner. A few coats of PVA should stiffen the paper sufficiently.