Looking at vscodes source-code I found this (there's a feature to reopen a file with a different encoding):

vscode\src\vs\workbench\browser\parts\editor\editorStatus.ts:

return this.quickOpenService.pick(picks, {
	placeHolder: isReopenWithEncoding ? nls.localize('pickEncodingForReopen', "Select File Encoding to Reopen File") : nls.localize('pickEncodingForSave', "Select File Encoding to Save with"),
	autoFocus: { autoFocusIndex: typeof directMatchIndex === 'number' ? directMatchIndex : typeof aliasMatchIndex === 'number' ? aliasMatchIndex : void 0 }
}).then(encoding => {
	if (encoding) {
		activeEditor = this.editorService.getActiveEditor();
		encodingSupport = toEditorWithEncodingSupport(activeEditor.input);
		if (encodingSupport && encodingSupport.getEncoding() !== encoding.id) {
			encodingSupport.setEncoding(encoding.id, isReopenWithEncoding ? EncodingMode.Decode : EncodingMode.Encode); // Set new encoding
		}
	}
});

toEditorWithEncodingSupport looks like this:

function toEditorWithEncodingSupport(input: IEditorInput): IEncodingSupport {

	// Untitled Editor
	if (input instanceof UntitledEditorInput) {
		return input;
	}

	// Side by Side (diff) Editor
	if (input instanceof SideBySideEditorInput) {
		const masterEncodingSupport = toEditorWithEncodingSupport(input.master);
		const detailsEncodingSupport = toEditorWithEncodingSupport(input.details);

		if (masterEncodingSupport && detailsEncodingSupport) {
			return new SideBySideEditorEncodingSupport(masterEncodingSupport, detailsEncodingSupport);
		}

		return masterEncodingSupport;
	}

	// File or Resource Editor
	let encodingSupport = input as IFileEditorInput;
	if (types.areFunctions(encodingSupport.setEncoding, encodingSupport.getEncoding)) {
		return encodingSupport;
	}

	// Unsupported for any other editor
	return null;
}

Maybe this can be to some help. Could it be the necessary feature is there after all??

add support for charset #35

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add support for `charset` #35