The requirement for temporary support mechanism to enable replacement of elastomeric bearings is usually not included in Contractor proposal.
Contractor usually will not use elastomeric bearings between topside stool and topside module. Contractor has been executing many FPSO projects without elastomeric bearings. During long term service, they have found no problem with steel-steel interface between stool and module.
Any horizontal forces at sliding stool, are considered in design of stool and module. Once the force is increased to a certain point due to hull deformation, the sliding will happen at steel–steel interface and thus release the force. So basically, the horizontal forces are under control and are proven not to cause any problem by actual operation at site.
Elastomeric bearings will increase CAPEX and OPEX. If there is pool fire on upper deck, the elastomeric bearings will melt down and create big concerns.