The tundra up grade only consists of brake caliper carriers that will move the calipier out a bit from the hub so you can fit the tundra rotor that is a little bit larger. However the swept area (surface area of pad to rotor does NOT change, you only gain a slight leverage effect by moving the outward a bit.
I do not think the above method is worth it.
The LC/LX has pleanty of breaking power but in my opinion it is the pads that suffer. They are a ceramic based pad. They will generate almost no dust and are silent BUT they lack initial bite, cold weather performance and heat capacity. A semi-metallic brake pad will do wonders for brake bite, modulation and pedal feel. But you get brake dust and dirty wheels.
In my opinion a slotted or drilled rotor is unnecessary for this vehicle. You are not going for lap times in an LC/LX. Just stick with a reputable brand with a “high carbon content” metallurgy.
When picking a pad most here recommend the Toyota TRD pad. The part numbers are the same for ALL years of LC200 even though they don’t list the newer vehicles. Another pad is the Hawk LTS but most think the TRD is better.
Stainless Steel brake lines can improve pedal feel. This is possibly the slightest amount of expansion in the factory rubber lines that will be removed with SS lines. However my ISF with Brembo braking system uses rubber lines and the pedal is like a rock. The amount of travel in the brake pedal in the LC/LX is by design and a function of the brake master cylinder and really can’t be changed.
If you do want to add SS lines the. I would look at StopTech or Goodrige. I prefer the StopTech because they are covered with an outer layer of vinyl seathing that keep grit and grime out of the SS braid.
TRD Pads here:
TRD High Performance Front Brake Pads PTR09-0C111
SS lines from stop tech: StopTech (950.44025) and StopTech (950.44519)