I did a few A0 size B&W posters with both text and images in the pre-computer era using only 35 mm microfilm (is it the same as lith film? very high contrast) and fibre paper. First I shot letters and numbers I needed from a typography book, then did a cut and paste (real, with scissors!) to glue together text blocks. Black ink was involved at some stage, IIRC, when I needed white text on black. This was shot once more on high contrast film to create paper negatives and finally exposed wet, emulsion to emulsion, for final print. Image had to be exposed separately into its masked space. Lot of work but results were good.
Nowadays an inkjet negative of text part is likely easier to use, but I suspect a paper printout shot on lith film and then contact copied would probably give a better result. I'd also consider text size and sharpness you want.