To nitpick on a couple things:
With roar vap, you're giving up a lot to counter something that can be countered just by being last, so to speak. Out of all the 4th move possibilities, roar is something I'd consider probably the worst option. I'd rank ib above it, for getting rid of egg and 2shotting zap where surf is usually shy, plus the freeze chance on ls blissey/ls starmie/raikou or something. Bp is a different utility altogether, but when needed, there's no substitute for it. AA is pretty straight forward choice, standard really. ST is obviously top choice. Sub is a possibility if thunder is popular enough. Roar literally only helps against suicune. Well attract missy too but yeah.
I used HB drumzard to troll fm and some others (zfs, flameout, etc). Ironically, it's one of those sets that work a lot better against better players. Playing calculatively and assuming you're going boggy is where it shines. Never used it in anything serious though.
I also think subseed egg is fairly standard as an alternative set (think in terms of psong gengar). I want to credit it to vil though, although I do know how much umby likes it. Just that when I suggested it for that jolt team of yours, I definitely got the set from vil.
Ml pass umby with either cray or sa should be up there as pretty gay but very workable sets.
If sing isn't the standard on fable, it should be. I haven't considered encore a legitimate option for the better half of this decade. Fb and hp ground are also standards a la snorlax.
The real problem with creative sets is that if they're really legitimately good, then they become standard sets and are no longer creative. That was the case with so many sets, charmbreon was a creative set gone standard. Same with encore raichu. Same with growth vap. Mixed dnite. The kanga set listed is the only set I'd ever use on her, and nitro ran it to great affect against some pretty good players. Subseed egg is ultimately a go to option for spikes abuse now. The time context is important imo.
HB charizard deserves its spot though.
Bordering gimmick, we have hp fire zap/kou, to hit both egg and steelix.
Triple attack zapdos is pretty good "mixed sweeper" (hp water, dp, thunder/bolt).
Idk if it's just me, but if and when I do run psong gengar, I always do it with two attacks and no protect. Cause I'm baller. ML + explosion has become standard now, so this toss up means I get to take your monolax for free.
Clamp cloy, if it isn't standard, deserves a spot. If it is, then clamp screech cloy definitely gets the spot.
We have jolteon running sub hp water agi pass (no tbolt), but a lot of pokemon can pull this off. Charizard can pull it off without FB, basically using its typing and its standardness for a one-time potentially gamebreaking surprise.
Expanding on the above, EQ/FB/LK/SD snorlax is a prime example and pretty awesome for explosion teams. You're forced to explode on zapdos or something if they catch on though, but when is getting zapdos a bad thing?
Random cursing bulky things, suicune is great, with either st, roar, or mirror coat in slot 4. Kingdra can pull it off too if it wants to.
I'd consider both thunderlax (with surf) and toxiclax good entries, as they never really picked up enough steam to hit standard status despite being in existence for so long.
I ran hp fighting haze rest talk dnite strictly to counterlax, but that doesn't work so well vs DE.
PS Jesus this was hard to type on the iPad. Pokemon should be a part of the standard dictionary.
PPS Yeah I'm aware I came off as a huge asshole with this post.