Rex,
We used to be able to order a dropped tang. I can't speak to that possibilty at present. I will check on it to avoid shop phone calls and let you know. A teardrop shaped handle will most certainly help. I have a green "canvas" micarta Stanaback Special-4" in stock that just happened to come out on my order this week. When I get set up to shoot photos, I'll take a couple and post them up here. Good question, dude!
As for "other" Randall shop-supplied handle material that would help with the "drop"...nothing comes to mind.
Best, Capt. Chris