It's been on my mind for quite a while...
I think it's almost absurd that you need to be in a clan for an entire 6% exp boost. If there were a way to visit a clan to gather for that clan, I could see a 1%-2% boost would be fair.
(I say this on the brink of going homeless and I still think it must be done after all these years)
Besides this...
The benefit from the recent golden cape, the 27d porter benefit, was very well deserved. We are losing a ton of GP not being able to cut a mahogany tree and profit because porter charges are so expensive. If there could be a way where there could be a clan benefit or a visit clan benefit to apply several days of free porter charges, I think that would be totally fair.
If not, there should be something that could supply free porter banks for putting in some kind of effort, or at least have the charges reduced in price somehow.
Some players just want to chop a tree sometimes, or even just fish sailfish and relax knowing they're profiting, not having a detrimental mindset that they would have to lose 70% of their profit to a porter charge... it's counterintuitive.
Clan Benefits or Clan visits could resolve these two aspects fairly, I believe.