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The looseness setting on sculpts does not affect thermo.
And as you say, emitting things means those things must be in the scene. So they're still in memory, and still using thermo. So this wouldn't help reduce thermo at all.
The engine does LOD stuff already. Smaller things or things farther away are rendered using a lower-detail version of the surfaces of that sculpt, and the flecks tend to disappear at larger distances. So I wouldn't worry about trying to make your own system to do this; it would only harm thermo and performance.
And objects that are fully occluded (hidden) behind sculpts aren't rendered at all--making that really efficient too.
If you're really interested in increasing performance, one small trick you can do is to group an entire area of the level that you won't see when you're elsewhere... then power it off while you're not in a position to see it. Rendering-wise the engine does that anyway, but it can help the engine out a little bit.