The inefficiency isn’t in the power consumption, it’s in material or time waste.

You can easily remove the heat if you dump it all into a material and then jettisoning that out. The problem is, you need to replenish that material quite often, and that becomes rather inefficient.

You can also radiate the heat out, but that takes a very long time unless you’re willing to utilize a relatively extreme amount of weight and material to that end. It is much much slower than in atmosphere.

An IR laser doesn’t really sound viable to me? They take a boatload of energy, and a huge part of laser design is dealing with the heat the laser produces. I don’t really see how you could a) collect the heat b) turn that into a way to power the laser and c) deal with the lasers heat output, that wouldn’t do more than dump a fraction of the needed heat.