When editing the diamond notehead, if you add a space glyph (U+20) followed by noteheadDiamondWhiteWide (U+E0DE) and set the X Offset for the notehead glyph to 1, the diamond notehead can be centered:
When editing the diamond notehead, if you add a space glyph (U+20) followed by noteheadDiamondWhiteWide (U+E0DE) and set the X Offset for the notehead glyph to 1, the diamond notehead can be centered: