Worth weighting the 90 as she is now !!
As you already remove the rear door,, remove the pass seat for events as well !!
Swap the doors for wolf/military type, and remove door tops, convert to rag top
The hybrid did not run a steering guard for a while, only fitted, for the like of LFH,, and the river bed at 7S,
Presume both guards are alloy ?? when the rally cars when on diets, the guards were changed to carbon, it was surprising what weight can be lost, inside the bumpers, door panel, under dash, tailgate etc with a hole cutter, but every bit helps,
However, can not see a LR gaining a lot on challenge type events unless you lose at least 250kg, and without a full rebuilt, i would think is hard !! i would not bother !!