you have to be ready to spend at least 3 or 4 weeks in the wild
I am not sure if you have actual love for all the mountains and being in the wild, but if you do I would suggest going to Cordillera Blanca instead. There in 3 weeks you can easily climb 3-4 beautiful peaks and experience much more scenery. And in addition you will actually have to wear crampons!
I went there this summer and had a great time. To acclimate you can do hikes to different beautiful lagunas and than pick a few peaks. There are easy and hard ones there. Highest peak is 6,768 M, so not that much lower in elevation than Aconcagua. Research it at least, the place is stunning and cheap. So is the food.