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For adding into MorphOS, I assume?

But otherwise it would be an option for such a program. And as told, RNOEffects can already do many of these things, there's a pixel editor, it can load both normal and selected state images from an icon, and it can save icons to AmigaOS, MagicWB, NewIcons, GlowIcon, OS4, PNG, and Dual-PNG formats. It can also save fallback images, icon tooltypes, and set icon type and other properties (default tool, stack, position, drawer dimensions, etc.). Batch creating/converting works too. Only thing it doesn't do is SVG icons, but I guess that'd be possible to add some day too.