^ you can't put speakers in there.. cause they are just not the same beast . The appeal of speakers has very little to do with what they have to offer in terms of soundstage over headphones to me at least.
And your other suggestions, yes i've owned the K1000, but guess what, didn't own it long. It isn't an ortho. It doesn't have that tonality. It is just too strident in the upper mids and the variations in the sound quality between different pairs is enormous..
Maintaining the tonality, having adequate headstage, the midrange quality of the orthos, good low end response without sounding anemic is very difficult with damping. Its almost an impossibility to achieve all of these things with damping. You are compromising one or several at a time depending on whether the driver is under damped or over damped.