Adding bedroom in walkout basement
The International Building Code and the International Residential Code both state that you only need a single clear egress path. However, if your maximum occupancy is more than 10 (in an R-1 structure), you are required to have two egress exits.

Two bedrooms with dedicated entry doors and a conjoining doorway should be sufficient. The additional window is a bonus in the one bedroom.

You can also call your local building inspector office for clarification.