Nice try, but it doesn't fly.
Ten cubits from one rim to another.
A line of thirty cubits did compass it round about
Compass is the limits of any area. Obviously the outer rim is the limit. Furthermore, was the author of this story just trying to confuss us by providing measurements based on different perameters for the same object. While these ancients were not particular savy, it would have been ridiculous even for them to give the measurement for the diameter based on the distance of one rim and the circumference based on the other rim.
The Bible makes no mention of the width of the rim.
You conveniently avoided my original reference. II Chronicles 4:2 "Also he made a moulton sea of ten cubits from brim to brim, round in compass, and five cubits the height thereof; and a line of thirty cubits did compass it round about.
Notice this passage, unlike Kings, uses COMPASS (boundry) for both the circumference and the diameter. There can be no doubt as to the points of measurements. Pi is unequivically 3.00 in this passage.