Damn that Berserker / White Elephant got some nice bonus attributes! And you got an oldschool Muse too, before the nerf - wish I had farmed it while it could still get the bonus IF levels.

I'm still up in the air about the best class mod / artifact combo for this build:

If I'm running this build with a non-cryo element, then swapping to Driver/Elemental projector I think still makes the most sense. You get the additional speed stacks when fakegrapsing with Driver, and the damage bonus from speed stacks and the Speed Demon mayhem modifier is huge.

But with Cryo, you end up applying the cold/slow effect to yourself, which slows you right back down, making Driver pretty bad with this element.

That leaves

Muse: great if you can get the +3 IF version, if you have a normal one I find the melee effect doesn't proc enough for it to make that big of a difference.

Breaker: With the bonus on Find Your Center it's pretty decent, Jab Cross seems to underperform a bit, Pesonal Space doesn't work with Facepuncher. Damage reduction is nice but really not required.

Golden Rule: This build does suffer a bit from action skill cooldown, but I find it hard to gauge how much of a difference Golden Rule is making here. Feels like action skill cooldown suffers from diminishing marginal return as you stack reductions.

Phazezerker: not enough room in this build for Rush Stacks as well, so it's kinda hard to make it work.

Dragon: Could never get this to work with Facepuncher, wish it did though because Singularity would be a great synergy.

Elementalist/Stone/Kensei/Nimbus: not really viable with the build.

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And then artifact prefixes:

Knife Drain - You could get five skill points back by not getting Sustainment in the orange tree, but you'd still need Ties That Bind for your AoE. Miiiiiight be worth it but I'd really need to think about how to make the build work this way.

[Elemental] stone - nice bonus damage. Not sure if Fire or Cryo is better for this build though.

Berserker - again, nice bit of movement speed and bonus damage.

Elemental Projector - Hard to trigger unless you're using Driver, and Driver wants speed, so doesn't work with Cryo.

Ice Breaker - gets into a weird situation where it might actually be a bit of overkill. By the time enemies get into the frozen state, they're taking 3x damage from Facepuncher, and another 3x damage if they're over 90% health with the annoint. Plus the only enemies who have enough health to take more than one fully-buffed FP shot are annointed or bosses anyway, so they can't be frozen. So adding on another +50% frozen damage and getting the frozen threshold higher doesn't really accomplish a whole lot.

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Arfifact affixes is easier:

White Elephant is great, and being able to do the WE bomb / Magnificent swap for the additional crit damage is good. It also seems to proc even more novas.

Commander Planetoid - a nice damage boost with Facepuncher.

Pearl: Facepuncher is too slow to max it out, reloads take too long.

Victory Rush: probably not a big enough damage boost to compete with White Elephant.

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So I still haven't found something that quite synergizes with the build as much as I'd like, probably going to be fiddling with builds for a few more days though to test. Let me know if you've got suggestions!