An alternative solution for the GOG version, which worked for me:
HEX edit "Risen3.exe", search for "39 8E E3 3F" (there should be only 2 values) and replace them with, in my case "26 B4 17 40" (21x9 - 2560x1080). That's it.
Although that will leave the HUD stretched. I fixed that by editing the "ConfigDefault.xml" inside "%gamefolder%/data/ini". Under "Aspect16x9" just swap the value of "VirtalWidth=" from "1920" to "2560".
Haven't tested it personally but I think it would work for 3440x1440 by using the "8E E3 18 40" hex values instead and of course "3440" instead of "2560".
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