Update for 2024.
I’ve hiked to and from Choquequirao independently. Excellent.

I’ve hiked Salcantay (or Salkantay) to Aguas Calientes independently. Then made the day hike early morning up to Machu Picchu.
BUT always wished I’d done the BIG adventure:
Trek Choquequirao to Machu Picchu, via Salcantay.
By 2024 organizing that is getting more complicated. And to do it independently, you should bring a tent.
Do your research and book Machu Picchu tickets long in advance.
Start with Meg’s trip report. 80 miles. 9 days.
On my trips I suffered biting ants in my tent on the way to Choquequirao. And terrible biting flies on Salcantay. Be warned.

https://besthike.com/2024/01/15/peru-%e2%9e%99-choquequirao-to-machu-picchu/