30 Luger

a family member has a SIG P210 in 9 Para (9mm Luger).
Just out of couriosity I bought years ago a drop-in-barrel from SIG in 7,65 Para (= 30 Luger).
The gun was (and is still...) precise and functiones flawlessly, even with the spring for the 9 Para barrel!
Velocity is of course lower than the 7,63 Mauser (7,62 Tokarev), but sufficient for hollow point bullets.
If you have a gunsmith who can manufacture a 30 Luger barrel with the outer dimensions of the standard barrel for the basic SIG Sauer gun types (P228, P 229, P 239), that should be a workable (and expensive, I admit) solution for a carry gun (both cartridges function in the grip size of 9 Para).
In the first time of production of the SIG Sauer P 220 (Standard caliber = .45 ACP) there were additional barrels offered by SIG Sauer in .38 Super, 9 Para and 7,65 Para.

Rolf

PS: My father bought two months ago a SIG Sauer P 220 in 45 ACP through the SIG Sauer custom shop in an all-steel version. That is an incredible gun! Functions 100% and shoots very good, even with me as shooter... I can only recommend the guns of this company!