Yes, you can use the AGMs. A lot of misinformation on the subject is due to people confusing AGMs and Gel Cells. Gel cells require different charging profiles.
In years past, some AGMs required different charging profiles too. But now they are plug and play. Especially with your stock converter and undersized cabling, which I bet you'd find rarely delivers more than 14.2v anyway. If you install solar, the better solar charge controllers are more aggressive, and in that case you'll want to make sure the controller offers a profile selection that will not over-volt your AGM.