Then why not use a blend of Stealth & an Industrial components? Such as, with a 3 person crew, you have 1 person dedicated to switching things between stealth & non-stealth settings. If the single Industrial cooler runs lower IR than the Stealth, you could have them turn on & off coolers & components to power up to attack, then power down to conceal while the pilot moves positions to set up another ambush attack. Or am I missing something obvious?
You can't turn off coolers, but you may be able to swap them with reactors on. We'll have to wait and see. But yes certainly, you can mix and match industrial and stealth coolers. It really depends what you plan to use the stealth for.
If you intend to hide and launch a missile barrage from stealth, you get first strike advantage and that may be all you need. Use stealth coolers. If you want to disappear off an enemy's scopes every time you circle in combat, use industrial.
The 400i is not a combat ship. Given the vast bulk of its use of stealth would be to go unnoticed, Stealth A coolers are just fine. Whether you would want to be able to disappear after being sighted really has more to do with the relative speed of the ship as related to its prey or hunter. So best choice is a huge, open question and having three spare coolers aboard would be a wise choice.
Note though, there are no "extra" players on this ship. It doesn't even have crew for a dedicated sensor/power management/missileer person. The guys sitting turrets are going to both have way too much to do without getting out of their seats to plug in new components. This ship needs players who are all on top of their game. Happily, it seems the whole crew will be seated together on the bridge, so they should have excellent communication. I love this part of the design.
We can't talk about the pirating/boarding potential for this yet as the Absolution Distortion Scattergun still has the new, pathetic figures that make it unusable. However, given the Absolution's pre-fubar figures, this ship would do 30k distortion DPS just with the pilot weapons. That's enough to disable a Lancer's shields in 2.5 seconds. This could make a fair boarding platform if CIG ever fixes the Distortion Scatterguns, since that sort of raiding requires stealth for a quick first strike out of nowhere.