No. Roc is removal of conditions to get a 10yr green card. Adjustment of Status is switching from non immigrant visa to green card. A K-1 is a non immigrant visa
Bags would still have to be claimed in Guam and cleared by customs before rechecking. This is true regardless of where you enter and connected domestically.
A k1 can only adjust through their petitioner. If she didn't marry or leave within 90 days she would be out of Status and subject to removal proceedings
Just be aware that you can't use esta to travel here and adjust status if that is the original intention. You can visit but must proceed via consular processing