It already looks too much.
Hello and welcome to the RTA forums !
On the way up is the smaller diversion but even then I don't think you have the time to do it with a week, as it is you will have very little time at Mt Rushmore or Orange county.
With approx 3300 miles to cover you are already going to be driving 8 hours plus per day with time only for short stops for Gas, food and bathroom breaks and a stretch of the legs so I am not sure where you will find time to add a Four corners diversion. With just one week I would choose either Mt R or Orange county, but not both, and take a slightly different route each way, Mt Rushmore for Four corners.