max. base diameter for the 10,75x68 is 12,57mm so there is no case for an easy conversion. btw, the 8x68 have a max base diameter of 13.00mm. unfortunately since RWS has dropped this classic round 20 years ago now there is no mayor ammo maker for this round. horneber make brass but only from time to time.
I dont know if the website is up to date but here in was a Gustav Genschow with scope for 6900 danish kroner, under 1000 euro iirc
http://www.huntershouse.dk/kat408-Rifler/side645-G.G.-Co.-%E2%80%9CKaba%E2%80%9D.html