Yes.
Yes.
EDENCOM flagged navy ships used a fair array of advanced hulls, actually. The State deployed Basilisk support to their fleets. Just as Scimitar, Oneiros, and Guardian support were deployed by the other respective navies. Advanced ships were present in the overwhelming majority of EDENCOM fleets.
State Navy Basilisk kill reports.
Same for Republic Fleet Huginn
Various advanced ships were indeed deployed.
On another note:
Pretty sure that discussion started in about as disgusting a manner as a conversation can start. Wasn’t many places it could go that wouldn’t continue to be disgusting.