Not really, The regulations state that it shall be bonded at point of entry where practicable - not practical.I am probably not understanding what you say here. Can I strap an earth cable to the water pipes underneath my supply board and that would be my water supply bonding sorted?
The regulations state that the gas pipe shall be bonded at point of entry where practicable.And could I then strap the water pipe at the boiler to the gas pipe and that is my gas supply bonding sorted? I just spent £40 on a roll of 10mm2 cable!
My view on this is - it is at the point of entry where the potential may be introduced. Bonding there prevents disconnection (of the bond) by alteration and isolation of the pipework inside the premises. If you can be sure that there is no interruption of the pipework inside the building then connection of the bond anywhere will achieve the desired result.
Doing as I stated above - using other parts - would require testing to ensure that they, themselves, are continuous and suitable for the purpose.