Proposed laws will stop police, paramedics and firefighters from having to prove they got PTSD from their job before accessing compensation and stop employers from discriminating against workers facing domestic violence.
They will also protect redundancy payments for workers and further regulate silica, the dust of which can lead to an incurable respiratory disease.
Silica dust can be created by cutting popular stone benchtops.
The four bills have been put forward by crossbench senators David Pocock and Jacqui Lambie and have been plucked from a larger suite of industrial relations reform put forward by Labor.
The four provisions of the government's omnibus legislation have wide support from the crossbench and the coalition.
But the coalition and business groups remain opposed to other provisions that would close loopholes that allow an employer to negotiate a rate of pay and then bring in labour hire at a lesser rate.
They also oppose changes to casual employment that will make it easier for some employees to transition into a permanent role.
The suite of changes will lead to undue burdens and costs for businesses in already challenging economic conditions, they argue.
Workplace Minister Tony Burke has refused to split the bill and have the non-contentious sections passed this year, saying the entire suite of reforms was needed to protect workers and get wages going.
Workplace Minister Tony Burke is refusing to split Labor's industrial relations bill.
The peak union body has backed the minister.
But the crossbench and the coalition have teamed up to try and push the bill through the Senate as fast as possible so the measures come into effect sooner.
It gives them the numbers to have it passed even if Labor fails to support its own legislation.
Labor has remained tight-lipped about whether it would wave the split-off bills through the upper house while the Greens have not publicly indicated their position on the independents' push either.
The broadly supported measures would deliver practical outcomes for workers who shouldn't have to wait while the more complex elements of the reforms are combed through, Senator Pocock said.
"It would be pretty extraordinary for the government not to support its own legislation, but if they don't it would suggest our concerns around these measures being used as a political wedge are well-founded," he told AAP.
A parliamentary inquiry into the broader workplace bill is due to report back by February 1.
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