Tempest Set VS Current Equipment

Yes totally possible, but not optimal.

 Spoiler

Equipment	Tempest	Empress	Alternatives	Comments
Weapon	Yes	Yes	Whatever you can find e.g. Azwan	Not the deal-breaker imo
Helm	Yes	Yes	Dogma, Mesoranger, CZak	Dogma has non-chaos-able 6MA
Overall	Yes	Yes	Mesoranger	Helm + Overall Mesoranger = 10MA => average 5MA each, not considering scrolling (20+-INT each is easy to get tbh);
Gloves	Yes	Yes	Flamekeeper or whatever MA-dumping gloves; anything that gives DSE and DSI	Seriously should get DSI if you're Lumi and you're rich.
Shoes	Yes	Yes	Chaos-ed Dark Neli/Varr/Mesoranger shoes	Not the deal breaker imo... but I've seen some pretty decent stuff
Cape	Yes	Yes	Helsium; Purple capes; Balloons	Helsium IS the deal breaker! Empress cape is zomg expensive!
Belt	Yes	No	Helsium; Witch belt and related; Mystic belt; Silent Crusade belt	Helsium! Witch belt! Mystic set gives 6MA and 7all for 3rd, 4th and 5th set effects i.e. 3-4MA on average
Shoulder	Yes	No	Silent Crusade; the usual forged shoulders etc.	Tempest shoulder has pot!!!
Earrings	Yes	No	Scrolled earrings, Mystic earrings	The second-last deal breaker
Pendant	No	No	Silent Crusade; Dominater, C/HT, MoN, Mystic, [spirit pendant]	Tempest/Mystic/Silent Crusade are Chaos-able. Tempest NOT part of set
Ring	No	No	Explorer's magical ring; you name it...	Whatever. Note Explorers' now give +20% min crit damage. Tempest ring NOT part of set BUT has pot!!
Eye	No	No	Mystic (1MA, 1 slot), Goggles, whatever you could find over the years	Not sure if Mystic is pot-able.
Face	No	No	Mystic (1MA, 1 slot), crafted face paints, Reverse DB mask etc.	Ditto above.
Nett	8 items	6 items	Empress > Tempest if you're rich. Empress // Mystic/Rising sun but Tempest not fully compatible	If we're ever getting those Rising Tempest set items... I wouldn't get them other than for looks (13 items!)

So pick any 3 from one set, and pick 3 others from the other set. You might want the Mystic set, or have your own accessories for that matter. However, I'm not so sure if you want to shell out so much for an Empress weapon... and also not sure if there will be Tempest Desperados. If I were you and I really want that HP boost, then I'd go like this:

Empress: Overall, gloves, shoes (the cheapest and most available of the lot too)
Tempest: Shoulder, belt, earrings
Events/in-game: weapon, helm (hur hur)
Choice of own cape

But why do you want the HP bonuses so much?

Hadriel