Unfortunately there's a major problem with doing a full head mask(latex) like most of those European Larp Orcs do, which is overheating. Dag is mostly combat-based, and a majority of the events happen during high temperatures. It's not realistic to think that you can pull off a look identical to theirs.
I honestly find it kind of funny how anytime anyone starts suggesting masks or prosthetics, people claim overheating as the primary reason not to...and then tons of those same people don enormous quantities of black leather, fight half-naked in full sun, wear lots of synthetic fabrics, or do any number of other things no less likely to cause heat-related problems.
Masks can get hot, yes, but there are ways to mitigate that. Wearing a helm or hat means not needing a full-head slip mask, and since the top of the head is one of the primary places heat exits your body, that goes a long way. For the bald or short-haired, wigs are another available option to keep from putting latex/silicone over your scalp; it's still material over your head, but they at least breathe.
As far as orcs go, a full slip mask isn't even necessary to get a good look unless you specifically want to incorporate the scalp. Partial-face prosthetics can work wonders; a brow/nose piece and a decent pair of ear tips can elevate your look to movie-extra status right off the bat. Tie-on face masks (including leather ones) are also an option, if you've got something to cover the back of your head. The right kind of helm can also make most masks or prosthetics unnecessary; if your helm covers your face and the rest of your kit is up to snuff, you still look like an orc.
Also, armor is one of the essentials for looking like an orc. If you pay close attention to most of the Euro Orc armor, it has a lot of sharp edges and other things that we don't allow(which i'm not arguing, safety always comes first ). Once again, just pointing out that it's not realistic to expect to look as good as them, as Dagorhir just isn't the perfect environment or game for it.
The jaggedy edges and such are of course disallowed, but not actually necessary for achieving a seriously high-quality orc look. I just looked through a bunch of Drachenfest orc photos, and very few of them are actually covered in spiky bits. Many have big horn-looking things on their shoulders, but they aren't metal and could be done in Dag with unhardened leather. Most of the actual steel armor I'm seeing would only require a few corners to be rounded off. What they do have, though, is tons of accessories; bits of bone and fur strapped to them or hanging on cords, scraps of chain, flappy bits of garment leather, painted-on symbols, etc. The added visual busyness and the fact that the accessorization is done well and with obvious thought put into keeping everything character- and setting-appropriate makes super-spiky WoW armor unnecessary.
Bottom line: are Dag orcs, on the whole, likely to ever reach the same level of quality as Euro-LARP orcs? No. Is it possible for any given individual Dag orc to reach that level of quality? Absolutely. It just depends on how much time, effort, resources, and most of all, thought, you're willing to put into the effort.