It is a PITA to get the oil tank off. You will need to drain the oil. You will need to remove the throttle bodies. That is easier to do if you remove the fuel tank, which is not hard, but adds to the job. (You should replace the crush washers on the banjo joint, but the old ones will often work.) If you have the original air plumbing then you will have to remove some of that. (Another great reason to go triple filters.) You should replace the rubber seals on the oil tank. You will have to make sure that you line the oil tank correctly when you put it back, or it will leak.
When you remove the throttle bodies you will find three clamps which are carefully designed to be inaccesible, and use a tool size that is not used for anything else - anywhere in the world, I think. When you replace them, try to point them in directions that can be accessed without the use of creative language.
Next time drain the oil from the bottom. I have used the drain crush washers 2 or 3 times each without problems.
Experience is what you get when you don't get what you want.
I think that I would get some cheap forceps with sharpish teeth and try to remove the tube using them before pulling everything apart.