Hmm... maybe replace the silver neck on the Handcraft with a brass one, or have it gold-plated so you could keep the original which is better, and then work on the mouthpiece reed/combo to find something a bit more lush? I don't think the action of the Typewriter is that versatile, since it has no rollers. I have a '55 Indiana which is basically like a Handcraft with a bigger bell and a little slicker action, I think. I've got a '21 Handcraft here (not playing) that I got for my friend and the body tube and basic design looks pretty close. Mine does have a certain brightness and edge to the sound, especially in the higher notes, and as you say the low notes are a little harder to breath into (subtone.) But to me it is generally warm, complex, and polite, my favorite horn at the moment, and I'm getting pretty good results with a Brilhart Tonalin and a Rico Royal 3. So I would say stick with the HC, if only the fact that you'll be able to roll between low C and C#, which I think its pretty important.