b0gh0s had a site (is down now) where he had a clutch replacement that did the locking, but since the site is down now, don't know if it's still available.
Don't forget, removing first also removes the OWB part, which is kinda heavy. And you are removing the clutch spring, ball bearing, and grub screw. Not to mention filing off the half-moon shapes. The screws do add weight, but is offset by a lot of what was removed. I think there still is a net loss, but cannot verify. At the very least, removing first gear removes a little drag from the OWB and simplifies things.
And this mod is "free"... always the best kind.
But, a machined clutch replacement would be nice. It would be just a matter of machining something that would fit where the clutch goes and have the pins (where the screws go in the mod) engage second gear.