Aug you need to get over the cosmetic thing, "cosmetic flaws in the cowling" and the resultant angonizing over them has killed more nice airplanes than you can imagine that's a fact. Just rotate the engine a bit and be done with it, nobody cares about the dumb plastic exhaust pipe except you
Sure the cline pump would work but think about that 75 bucks, is that plastic pipe in the cowl worth that to you. This airplane is very poorly thought out for an inverted installation, for such an installation to be successful the airframe needs to have a sufficiently deep bodied fuselage immediately behind the firewall and that one does not.
Here are a few extra practices to observe when operating an inverted engine in airframes where it is practical:
1. Never fill the tank and leave the airplane sit in the sun. As the fuel heats up it will expand and can start a syphon or worse cause a hydro lock if the crankshaft of of a two stroke engine is in the wrong position.
2. With a two stroke glow engine always have an accessitble loop of the carburetor line outside the cowling and after fueling use a hemostat on this loop and do not remove until the point you are ready to start the engine.
3. At the point you are ready to start the engine without fail do not forget to manually turn the engine over with vigorus flips to check for hydro lock before ever touching it with an electric starter.
4. At anytime that hydrolock is detected always remove the plug Turn the engine over vigorously with no plug then using your ignitor attach it to the plug before reinstalling for around ten seconds to allow it to burn off the gunk.
5. When carrying the airplane when tanks are fueled or empty never carry it nose down always nose up. If you have a helper make sure they know that.
6. Even when the tank is emptied what can happen when the airplane is carried nose down is if the crankshaft of a two stroke engine is positioned just right and the engine mounting orientation is just right all the gunk of previous flights that remain in the muffler can and will drain right back into the cylinder head and next time you hit it with with a starter without checking, Well?
So Aug think about if the pretty little exhaust pipe on the cowl is worth the 75 bucks for a Kline pump or the need for all those extra operational steps I just outlined above.
John
Edit: I just added a photo that illustrates the use of hemostats for a full inverted installation that I outlined above in step #2. Notice the medical hemostats that lock have been clipped on that external loop of the ling that goes to the carburator so this airpane has been fueled and on the ready parked in shade. This little loop also serves as the best place to fuel from with a simple cut at this location and therefore only a two line system is required.