Have you considered asking Eugene Golubtsov [Lugerman.com] if he would make a toggle for you??? His profile/email address is at -
http://forum.lugerforum.com/member.php?u=10195
A search here will show some very impressive photos of his Luger work. And he is here in the US; no hassles with Customs over restricted items.
His custom Luger carbines are really beautiful.