I think reversing the order of the pages would give the required brochure, so instead of having the pages in the Pages pane in the order 1,2,3,4 if they were instead 4,3,2,1 then the brochure should print correctly for RTL. Test with sample below.
ReversedOrderForRTL_Brochure.odg (10.8 KB)
I cannot use LibreOffice brochure print because it fights with my Brother printer so I always have to use the Brother driver to do the layout; it offers right binding as a matter of course. Check if your printer offers Brochure printing.