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The minimum requirements are there for them to set a lower limit on what they’re willing to support. You do whatever you want, just don’t complain when something doesn’t work, or breaks because you’re bypassing those limits.
People do this all the time and then complain and blame Microsoft for issues when they are using an configuration they were told was unsupported and might have issues.
In the Star Trek Encyclopedia, 4th ed., vol. 1, p. 244, the Enterprise-J is identified as a Universe-class starship. The same reference book additionally described the ship as having an overall length of 3219 meters.
I can’t find a reference for the Breen Dreadnaught size though, not enough beta canon material for something so new. I can’t find a good source for Fed HQ size to compare either, just that it is actually a Pax class starship, but no size for those.