So! I kinda wanted to play around the off-meta build. After stumbling on YT on some video, I thought "Hey, maybe Foray doesn't suck as much as I thought?"
And here's what I've come up with.
Weapon is Odo+whatever. For reinforcements try to roll 2 atk, 2 elem, 1 sharpness.
Charm is ATK2+AGI+CritEye, but I think you can pretty much run anything you want? If you run AGI3 charm you can add more WEX, if you have some other RNG charm that you like, like PP+something, you can take out the WEX deco and slot AGI in there. If you don't have ATK2 on your charm - don't bother with Attack 3 deco in the weapon, better to slot CritBoost 3.
IMO the BiS would be something like R7 Power Prolonger 3 + Agitator 1/Foray 1/WEX 1 with a lvl2 deco slot (so you can have MM3 instead of 2), but I don't even know if that exists.
Since you'll be spamming status stuff - you can pair it up with another weapon of your choice built for poison. I prefer CB, but another SAxe, SnS, or even DB would work great, I think. Anything that gets a ton of status procs.
For weapon decos - Crit Status is a must, but you probably have a lot of those lying around. I personally strongly prefer Rapid Morph over Power Prolonger, but if PP's your jam - go for it. Or, if you have a God Charm with PP - you can run both.
Stun Res 3 is my personal preference, you can run whatever comfort you want in its place.
Arkveld Gamma is there, essentially, for the Blight Resistance, since Convert Element does nothing for you, so if you wanna run something like Azure Age + Lagi or two piece Udra for Counterstrike - you're free to do so.
Playstyle - Rising Slash, Triple Slash, FRS spam.
My personal experience with that build up to 9-star hunts (didn't test it on any ATs yet, but I have strong doubts due to their sheer healthpool and kinda necessity for elemental damage, at least for Arkveld):
It slaps. No, seriously. I was expecting it to be a bunch weaker than the usual GoreGuts+PP set, but it turns out - your DPS really gets high if the monster can't fkn move. I had up to five paralysis procs on a single monster, which, coupled with the insane meter gain from triple slash, power axe uptime from wound popping/sneak attack and Foray - gives you insane damage windows. You practically delete anything that moves, because, well, it can't anymore.
If you're tired of farming Gogmazios for those elemental weapons, tired of NOT rolling Gore+Lord's Soul and just wanna have fun - I thoroughly recommend this build.
Imma go try and slap some ATs with it, see how it goes, report in the comments.
UPD: Changing AT Ark pieces for AT Udra pieces is a net positive overall, since you get Counterstrike 3, Resentment 2 and Speed Eating 3, while losing useless ConvEle and kinda useful BlightRes.