GIMP :: Export To PCX Doesn't Give Any Options And Exports 24bit Color

I used to save images in 1-bit PCX format, as required by several label(thermal transfer) printers. I can't find any way to do that anymore.

Export to PCX does not give any options, and exports 24bit color.

Even after changing the image format to indexed, and selecting 1-bit B/W,export to PCX is still

8-bit colour, 300 x 300 dpi, RLE compressed

Any way to accomplish

1-bit colour, 72 x 72 dpi, RLE compressed

Note that another accepted format is monochrome BMP, but this does notseem to work either in GIMP. The only options offered are RGB.