Sounds like a good plan. You should be able to save considerable money on the 7.5JJx17 ET15 Sequoia/Tundra wheels if you shop patiently on craigslist. But have to buy the hub spacers. That's exactly what
@Tools R Us was running, plus others too, I think. Well proven. He wrote that he had 1.25" spacers but was getting pretty close to bodywork on the outside and would go with 1" spacers if he was to do again.
ET15=positive 15mm wheel offset.
1" hub spacer = negative 25.4mm offset
So - the total is simply added together = -10.4mm (-0.41") say - just shy of 7/16 inch outboard from stock. Just right - needle threaded.