There is actually no need for alternative pipework if it is installed correctly.
I think what you are referring to is to the old style pipework.
When making the installation there is a stabelizer bar held in by two bolts which will be stoping the pipe from sitting higher. Undo these. Knock the bolts out and put
them back upside down so they face up over with the nuts on the top rather than facing the bottom. The pipework when installed properly does not sit down below the bed level.