My experience with inline filters are that the bullet /bronze ball style let some of the fine stuff through anyway, and they clog up PDQ if there is much coarse stuff, and the pleated paper are fine on both but the ones I got couldnt cope with a little water in the petrol and virtually stopped flowing as soon as they got wet.
Others may be better, but I dont have the inclination to experiment.
So, on balance I would sort the problem first, clean and recoat the tank and use the bullet ones to protect from introduced dirt.
And change them as a mojor service item.
Adelaide Hills, Australia. 93 R100 GS, 77 R75/7 ,70 BSA B44VS, , 86 R80 G/S PD, 95 BMW Funduro F650 ST