It is “gimmicky” by nature of it existing outside the meta. However, VS and ZF do work well together in theory because if you’re running ZF you’ll want to take as many channeling skills as possible, and scepter has 2, Air auto and Earth auto, which unlike the dagger’s 2 channel skills, aren’t on a cooldown, Earth auto can be paired with fire wall, and Air auto is used in Fresh Air builds to proc criticals, so both skills can be decently used. VS grants a minimum 50% recharge increase which bumps to 100% when using a channel. Also take Ether Renewal for another channel, plus it’s an awesome heal with condi removal and a crazy fast recharge.
Do note that Endurance Regen does cap at 100%, so one could see using both traits as overkill as the “full” effects of ZF will never be reached because it only increases regen by another 50% with VS on rather than it’s usual 100%. On the same note, taking both is pretty much the max you’ll want to focus on endurance regen even on such a gimmick build. I would use a different food buff because of how much endurance regen you already have, probably something that gives power or precision.
I would use this trait combo in a modified form of a Fresh Air build. Use S/F for good defensive skills to be paired with your increased # of dodges. (2 blinds, Obsidian Flesh, Magnetic Wave, Swirling Winds, and Gale just to name a few) By wising using your dodges, channels, and defensive skills you can mitigate a good amount of damage. Use S/D for an additional channel and more damage based skills. Adding 30 points into Arcana nets you Evasive Arcana, which with your increased dodges is especially potent. This trait build lacks power from the fire trait line, so consider Zerker armor to make up for lost DPS along with increasing crit chance and crit power for fresh air, and also take 10 points into water for vital striking, which combined with Scholar Runes will give you a 20% damage boost above 90% health, which, if you’re using S/F and dodging/using blinds right, shouldn’t be hard to maintain. This build also makes you glassy, so if you screw up your dodge/defensive rotation, you’re toast.
The above is by no means a highly viable build for Ele nor one I recommend you try speed clearing or PvP’ing with, but if you want to try out endurance regen, it won’t kill you, provided you don’t mess up those dodges. FTR the above is basically what I’m currently running, and while I’ve sworn at myself for doing something stupid and getting killed, people have also stared in disbelief as I throw myself all around the battle and never lose one HP.
