The tech for Tripods was never lost. Just rarely used to there could be Tripods i the Solaris games already. I do think that the dual cockpit set up would put them in a different class/division than most standard mechs.
Unless the Tripods did really well, the Houses would see them as a curiosity. Maybe as a defensive mech or to make better use of warriors who are deficient in one area or another.
Copying would depend entirely on how successful the Tripod would be but I think the dual cockpit would work against it in most cases.
As Tripods are so rare, they would be a big curiosity.
Beyond the dual cockpit and not worrying about facing, they'd be good in confined areas but I think most of the attention they'd get is because they're so rare and odd.