Several years ago I saw a converted Blood Bowl team that used the Bretonnian knights on foot from 5th edition as Blitzers. That seemed to be a great idea, which I am now trying to copy as I'll finally get to play in a league again.
On the third one I clipped the weapon and repositioned the hand, which turned out to be more difficult than I had thought, so on the fourth one I just clipped the weapon and left the hand as it is.
This one was more complicated as normally his sword is connected to the body over the whole length, so I had to carve it out and resculpt some of the details. (Looks somewhat messy as the mini was primered, but it should be okay once I spray it again.)
Sadly I could not procure the fourth knight on foot, so for my fourth blitzer I had to do something else:
This is the upper body of the Green Knight on the legs of one of the plastic humans from the Blood Bowl starter. The legs aren't ideal as I had wished for something more heavily armored, but I didn't find anything better in my bitz box.