Since the .45acp has the common head size you could build a sporter on most any Mauser or Springfield action. Getting it magazine fed would be more effort though.
I heard someone was going to make a non-suppressed version of the DeLisle carbine, but I never heard it actually happened. So, you could have a Mauser or even an SMLE action converted to shoot .45acp, if going the semi auto SMG lookalike route doesn't appeal to you.
Cost? no idea, would depend on who does the work, I would expect. You might luck out, and find a "mad machinist" who would take it on just as a project, good luck!
I also recall hearing, some years back, of some M1 carbines being converted to .45 Win Mag. Seems like if you could do this, you could do it in .45ACP. Again, since no one is doing it as a market item, it would be a one off, and cost a pretty penny.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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