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I don't know much about the .450 Alaskan but the .50 Alaskan has been used successfully for head shots on elephant. These however are essentially lever gun cartridges for shorter actions and you may still be limiting yourself in a double rifle.

If your gunsmith has already fitted .458 caliber barrels to your DR, why not ask him to chamber and regulate a .450 No.2 NE for you? This lower pressure cartridge should work fine in an action built strong enough for the .450 AK and you can use it to stop anything on Earth. A good old .45-120 with custom smokeless loads to throw 480 gr. bullets at 2100 plus FPS would also do the J.O.B.

Then your 9.3 could be your plains game and backup DG cartridge. Problem solved.

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The .450 Alaskan has a few gr. MORE capacity (Donnely - 7gr. more) than a .458 Winchester mag.

Mine,(.458Alaskan) in a bolt actioned rifle, had no problem making 2,200fps with a 500gr. Hornady at teh same presure as a .458 mag. - probably over 50,000psi. Whatever the .458 Win.Mag. will do, so-will the .450 Alaskan. Originally, it was a lever rifle ctg. Originally, the .45/70 was a single shot ctg. What the round was originally, does not prevent them from being used in other actions, of course. Such is the case of the .450 Alaskan.

In a DR, I'd go with a longer case for Africa. With safe loads for a DR- say around 40,000psi/cup or whatever, I'd think the .450 Alaskan would easily do about 2,100fps to 2,150fps with a 450 solid.

It's short, and due to the bottlenecked case, has less powder compression issues than the .458 Win Mag.