Show me with Code where metallic pipe is a permitted bonding jumper.
kind of getting back to your claim the first 5 feet of water pipe inside a structure is not an electrode here, but your question here complicates that a little depending on how you see those first 5 feet of pipe.
How about running a GEC to the first 5 feet from entry of the water pipe, then attaching a bonding jumper anywhere in those first 5 feet to continue on to another electrode?
The GEC must be continuous from attachment to service equipment to the electrode it supplies, first five feet of a water pipe is considered part of the electrode for the purpose of attachment of GEC or other bonding jumpers to or from this electrode.
s
Here is 250.52(A)(1) 2011 NEC:
(1) Metal Underground Water Pipe. A metal underground water pipe in direct contact with the earth for 3.0 m (10 ft) or more (including any metal well casing bonded to the pipe) and electrically continuous (or made electrically continuous by bonding around insulating joints or insulating pipe) to the points of connection of the grounding electrode conductor and the bonding conductor(s) or jumper(s), if installed
Sure looks to me they intend to include the first 5 feet to be considered as part of the electrode for the purpose of attaching the GEC and jumpers to the electrode, I do understand those first 5 feet are not buried in earth and are not an effective part of performing the duties of the electrode.
Similar with a ground rod or other made electrode - the buried portion of the electrode must meet minimum length requirements to be considered an effective electrode, does the GEC connection to said electrode also need to be buried as long as there is enough buried section to the electrode? You can also attach a bonding jumper to this same exposed section of the electrode to run to other electrodes.