What I obviously need/ Newly found oil injection problem

This bike has been sitting in a greenhouse for at least 20 years. The sunlight has taken its toll on any plastics, rubber, and fabric. This is a list of things I can see I need to fix/ replace without any dis-assembly.

What I need (as of now).

• Carburetor to air-box rubber boot. (This rubber boot is decomposing before my eyes)
• Front and Rear fenders 
• Brake/ Clutch Cables 
• Tires
• Throttle assembly and throttle cable 
• All fluids (Transmission oil, engine oil, gas)

Recently discovered problem with oil injection
This bike is a 2 stroke,  meaning there are 2 revolutions of the pistons for each power-stoke. With all 2 stroke engines you must add oil into the gas, the oil acts as a lubricant for the piston within the cylinder. This specific bike does not require the rider to mix oil and gas. There is a separate tank in which oil is stored, this is located within the frame. The oil is fed into the gas line as needed, this makes the chances  of adding the wrong amount of oil to gas less common.  After much research I learned that within this oil tank, there is a foam like substance to prevent the oil from moving/ splashing during riding. This foam deteriorates overtime and if the bike is ran with loose foam in the oil tank, the foam will clog the carburetor.
I now need to extract the foam from the tank within the frame. The best way to do this (I believe) is to first, remove the gas tank. Now that the gas tank is removed, the area of the frame in which oil is stored is revealed. A wide hole should be drilled, wide enough to allow tools to access the tank and scrape the foam out. From here, it's a tedious process of vacuuming, scraping and washing the foam out of the frame through the hole I have recently drilled. After all the foam is removed, replacing the foam is not necessarily important because it did not serve an important purpose. From there, all there is left to do is weld a patch over the hole I just drilled.