#secondaryeffectalways is currently bugged and won't work. It will be fixed for the next version.
The sprite is huge. What about using the sprite 375? It's a prophetized Jotun Jarl, who gets to wear golden mail. He has shield and a sword, which is Greatsword and not a Jotun Sword (pretty much identical, but the giants were cahned to use the latter for DomII). There's also Jotun Jarl 436, who seems to have been redrawn for Dom3. His beard can be clearly seen, though.
They are still sprites of Size 4 creatures, so you could change Beowulf's size to 3.
As for size 2 sprites:
There's Sidhe Champion of DomII, unit nr 850. Green and red, armed with a golden sword and a shield. Myrmidon champion, 1076, could work. Marverni or Ambibate Chieftains, 1215 and 1218, could work.
The sword might be too powerful. Base damage 16, plus his strength 17, AND it has #armorpiercing... #dt_demon or #dt_holy might work better. Also, one-handed swords are usually length 2, not 3. Giants' swords would be 3, as Greatswords.