Try to unclutter the ghostscript package in roughly this manner:
grep -Fi z11 >ghostscript-lexmark-z11.list
grep -E \'pentax|pj\' >ghostscript-pentax-pj.list
grep -F 2070 >ghostscript-lexmark-2070.list
grep -F 2050 >ghostscript-lexmark-2050.list
grep -F dj >ghostscript-dj.list
grep -F lj >ghostscript-lj.list
grep -F lm1100 >ghostscript-lm1100.list
grep -F ml85p >ghostscript-ml85p.list
grep -F oki4 >ghostscript-oki4.list
grep -F z42 >ghostscript-z42.list

Create subpackages accordingly.
(I\'m a bit unsure about c2070 and c2050 being for Lexmark and for a single model, take a look at the descriptions in the ghostscript bundle).

See if there are any other printer-specific files, especially in /usr/bin

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