Lancaster:
Such a nice aray of arms from Masuer origins and Calibers. I envy your 1888 in the 9x57. They are so similar to mine in 8x57J. I can relate to the desire for the 10.75. This is like looking to a feasable .40 Whelen. It worked and was a popular game getter. I have just sent off th 1893 dutch mannilicher in 6.5X53R to have some barrel work and then finish up as a light short carbine sporter.
The M146 in 9.3X57 is off to rechamber to a 9.3X62. This will sit well in the the line of Mauser actions sporters ranging from 7x57 to .375 HH. The mannlicher will be a great companion of the 1888 commission sporters. I would like to have one of my '88 sporters in the 9x57 or 10.75. They are, as you see, very handy and functional sporters.
Good luck in your obsession.
I can certainly relate.