Contractor Pre qualification /approval systems Cat - I agree in part - but all Clients are doing is handing their own due diligence out to a third party, so if you worked for multiple Clients like we do (over 50 Clients - local authorities and independent) then you would still have to go to those Clients.
Surely if you are ISO accredited for 9001 for QMS, 14001 for Environment and 45001 for OH&S then these should be more than enough to satisfy Clients - these are international standards - these are also quite costly but if all Clients accepted this accreditation then this would solve the problem??