I saw a cluster lens removal in CC a while back. They used asmall drill bit to drill the center of the melted plastc points. Just enough to allow you pop the mount. They used small screwsand clear washers (hobby sized for plastic) to put it back together.
This was on a sweep cluster, and the screws were not visible, not sureif your cluster has mount tabs like that. A soldering iron mightmake a sloppy job if you aren't careful.
I have done this kind of repair on RC cars and models to removeplastic/glue mount tabs. Try it on a junk cluster and keep usposted.