9004U is decommissioned and a closed road as per the Coconino MVUM. https://www.fs.usda.gov/detail/coconino ... rdb5356224
However, 9215B is open and in reasonable driving condition (as of last fall). You'll want high clearance the closer you get toward the end as there are some pretty good chunks of SF Peaks lava rock and one deep drainage that is often full of water or muddy. Even if it's dry you'll want clearance to go through. Though at that point you're pretty much there so it doesn't really matter.
This road does not currently get all the way to Alfa Fia, however the old roadbed is used frequently by hikers who connect between there and Aspen Corner on the Snowbowl Road (crossing the AZT along the way). There are a bunch of mountain bike maintained tracks in the area too. No shortage of access.
You can see this on the FS layers of the map, combined with satellite view. [ custom map :: map ]