Tequila, Orujo, Sherry, Rakia, Grenache and any other form of of native wine, beer or liquor that can be reasonably acquired in quantities sufficient enough to drown several robust horses in.
Also guns. Primarily of the pulse variety though any additional surplus you may have would be phenominal. Condition nor additional cost of the weapons is not an issue so long as I might confer with resident engineers to discuss upkeep and repair.
While your vessels are craft of extraordinary design and quality I do not feel that our current working relationship with the Empire, as our contributions have been both mundane and expected, warrant such a grandiose offer at this juncture.
Perhaps some months from now, as our relations deepen and mature. For now, the guns (and drink) would be enormously appreciated.