[Shadowcat]

Removing the blhole FLAG from the .ini file in the stars directory only makes the game crash, so I'd say your best option at present is to have an anti-graviton shunt installed by default to negate the gravity effects and then go about changing all the relevant graphics and text to suit.

Check out items\sy_antigrav.ini ... It may (or may not) be the case that you could add the "TYPE antigrav" from its DATA section to the DATA of other items, effectively giving all ship systems anti-gravity properties.

Failing that, you could at least rename the AGS as something that you wouldn't want to remove (even though you could), like pretending it's the ship's power source or some such.

Keep the Primordius quest in mind, too.