Applications focused solely on applications on improving access, recreational, and workforce development activities are prohibited, but may a PR propose a project that solely focuses on these activities?

No, subawards focused solely on those things are also not eligible. From page 10: 

Note: Subawards may also include activities that improve communities’ access and enjoyment of restored areas, provided they are a part of and enhance an eligible project that accomplishes and is directly related to one of the activities in the list above. Projects focused solely on access and recreational activities will not be considered.  

Likewise, subawards may also include activities related to workforce development  within communities, provided they are part of and enhance an eligible project that accomplishes and is directly related to one of the activities in the list above. Projects focused solely on workforce development will not be considered. Applications that choose to include workforce development activities should review the workforce     development guidance and resources in Section VI.B.