If it consistently follows that format of
then there’s really no reason you shouldn’t do basically the whole thing in Dorico.
You might find that it’s easier to do the front matter (title page, contents page etc.) in a word processor or desktop publishing program.
P.S. Dorico exports PDFs, PNGs, SVGs and TIFFs. It does not natively support .ps export. To the best of my knowledge, Word cannot import .ps files either. In fact, Word is pretty terrible when it comes to dealing with graphics - even if you import a vector image, Word will immediately convert it to a raster image, meaning that if you stretch/scale it it will likely pixelate. Compare and contrast to e.g. Apple Pages, let alone InDesign or Affinity Publisher, which will happily import a (vector) PDF from Dorico and keep it vectorised.