TL:DR - add +1 to all Inquisitor skills, shift conversion of fire (and maybe cold) from Firestrike to Aura of Censor and buff damage bonus to Savagery and Firestrike to bring Purifier and Vindicator builds up to meet Lightning Cadence Tactician spec.
Right, so I’ve been messing around with Purifier and Vindicators using this handgun.
On the Firestrike side it performs a bit better, but ultimate the damage potential feels lacking to Cadence in SR80-81 testing. Also getting FS’s first node up above the softcap and supporting lighting damage is “fun”, while the lack of skill points results in not being able to use Brimstone. Because WPS in Inquisitor eats up a lot of skill points. Mind you, 22/12 doesn’t bring anywhere enough DPS to be worth it.
Current status:
I’ll still do some more tinkering with it, but don’t see much in a way I can push things further.
Which in turn makes me think that if it had a +1 to all Inquisitor skills it would help hugely. While moving the conversion on Firestrike to Aura of Censor would allow for much more build diversity, especially if it also had cold conversion. But that can be got with other gear more easily 
Oh and more lightning damage wouldn’t go amiss either.
Now as for Savagery, there’s a lot more potential in that than with Purifier, simply because there’s more gear supporting Savagery for that mastery combo. Main issue of course is once again skill points and getting enough with Inquisitor to make WPS effective. Which has lead to three builds:
Set-less Savagery:
Does okay enough. Easy to get 26/16 on Savagery.
Ludrigan Set
Best of the 3 from SR testing. Simply due the conversion on Chilling Rounds. Uses Spear of Heaven due to having conversion to lightning and makes it significantly faster as a result.
Ultos Set:
Hardest to build, because Ultos-lawl. Took 2-3hrs and a lot of deaths to iron it out
Main weakness of all 3 is the lack of pass through on Savagery, which combined with the middle class DPS makes them all slower than the Cadence Tactician, which is weird given all the elemental resist RR + lighting RR available.
And even abusing Glyph rings to boost flat lightning I don’t see the best outcomes DPS wise, especially with the issues with stacking enough attack speed and covering resists without abusing double greens. Can probably get it close to 200K, but it’d be a nightmare survivability wise, as would have to skip Ghoul and Tower to get more elemental damage etc.
Definitely a lot, lot better than the before the patch that overhauled the Exonerator, because I left the oldest (Ludri, Ultos) languishing and unplayed since I made them last year 
But yeah, with some small tweaks it could help push lightning damage focused dual pistol builds that aren’t lighting Cadence up to a much better place. Not top 20 of course, just capable of getting closer to lightning Cadence damage output.