I ordered some cheap Lexus center caps from ebay. I pried the sombrero off and stuck the new "L" pieces on. They weren't exactly snug so I used some VHB to assist in securing them. No damage done to the TRD center caps, so this would be easily reversible.
No issues but it took some work. I have lifted the AHC using the bracket. Later I added the spring spacers but only because I was changing fluid and had it drained anyways. I did not need them to fit the tires. Wheel spacers I did need. I used 1.25" BORA spacers which did NOT require trimming the wheel studs - at least with the TRD wheels, although I suspect most wheels would not require it either. When I have the wheels off next, I'll snap some pics. I think I have a rotation coming due. I trimmed the rear side of the front wheel well after I removed the front mudflap thing. I did some reshaping of the liners using a heat gun. Best collection of info is here:
LX570 wheel well "adjustments" for 35s
Rhino-Rack part numbers: Platform is JA8647 (or 42107BF depending on where you're looking) and Backbone is RTLB1.