Bit depth/color space conversion on export/save as PNG

Hello, I work predominantly in 16 bpc, and when it comes time to export, I must first merge all layers and then convert the document to 8bpc, otherwise my PNGs export as a higher bit depth and have a significantly higher filesize. After exporting, I then have to undo all the merges and property changes.
A way to convert it down when exporting, such as a checkbox in the export or advanced export settings, would be very helpful. Thank you.


Can you Export as 16-bit, open that 16-bit .png and convert that to 8-bit?

I could, that’s about as many steps as just merging first and then undoing so it probably wouldn’t save much time.