Excellent question Harm I agree with you that could be the next step in moving the WaSH'Em tool forward. I believe there are a few examples from other countries on their website. Meanwhile what I do to help my design is :
-Evaluate the needs of supplies brought by the recommended activities (mirrors etc..) to build my supplies plan and adjust my hygiene kits and sensitization materials
-Assess the number of staffs needed for each activity and possible mutualization/pooling of Hygiene Promoters who could do more than one activity
-Budget these into the overall plan
-Prioritize by impact vs resources: prioritizing the activities which require the less HR/Budget/time but with the biggest (potentially/foreseen) impact
-Include them into my workplan or HP action plan, starting with those which are the easiest and less time consuming (to be able to evaluate sooner some impact)
-Make sure you frequently discuss with your implementing team to appraise and assess after some time to constantly re-adjust priorities and the way you do it