This does not require a law, although that would be better since then to change it you'd have to repeal it.

All bills must have an appendix and each paragraph or clause (which may encompass more than one paragraph) must be sponsored by at least one member of the respective chamber, who must name themselves in the appendix.

This instantly stops the "bills written by lobbying entity" games.  Yes, they can still try to do it but now at least one member of the chamber must be put his or her name on each paragraph, and therefore be responsible for same.

As things stand right now once a bill is originally filed (which requires at least one member) who wrote what ends up in it is completely without accountability and nobody is forced to take ownership of even a single sentence.

This must stop right now and it must become policy that until it does absolutely everything is vetoed no matter what the bill is.

This really ought to get passed into law and therefore can bind both chambers but since each chamber can control the form and substance of its own business each can write this into their own rules for consideration and one can effectively force both by refusing to take up any bill that does not contain such an appendix that is submitted from other.

This is how we stop the 1500 page monstrosities immediately that are filled with things like "renaming offender to justice-involved person" and similar claptrap, never mind very substantive policy changes such as extending and expanding pandemic-era authorities, both of which are in the current CR.

Accountability must return to the legislative process.

This is the fastest and easiest way, and can be implemented in a literal 30 seconds.