If my ruq pain was gallbladder related, would consuming a large fatty meal at least sometimes replicate the chronic pain ?

Yes, it is often so.: Gallbladder basically is a small bile-storage bag which gets squeezed on demand--i.E when you eat, especially with high fat, the gallbladder squeezes harder to get the bile into the gut to help digest the fat. So if you have a small stone partially/completely blocking the tube/duct, the squeeze causes pain. Thus, fatty foods often make the pain worse. If you have recurring pain, consult doc. Gl.

Yes: There are many possible causes of RUQ pain. Many people with RUQ have their gallbladders needlessly removed only to find their pain is no better afterwards. If one has symptomatic gallbladder problems it would almost always be triggered by a large fatty meal at times. I would see a good doc, preferably holistic, to try to determine the actual cause(s) (food allergies, parasites, spasms etc.).