Hello thanks a lot for your question. It is really important.
I would like to suggest maybe you explain a bit more...but
1. the FAO KAP tools do not only count women reached by a specific activity...there are several/mutiple information related to the knowlegde and attitude of caregivers related to IYCF...so that is really a good guide to firm up your KAP indicators based on what you need....
2. when you look at knowledge and attitudes there several KAP survey tools that were designed and used by various agencies in various contexts (these are just examples available on the net)
a) https://www.nutritioncluster.net/sites/nutritioncluster.com/files/2020-01/iycf_kap_survey_report_syria_vf_1%20%281%29.pdf
b) http://www.nutritionhealth.or.ke/wp-content/uploads/MIYCN%20Assessments%20Reports/Kajiado%20Loitokitok%20MIYCN%20KAP%20Report%20-%20May%202012.pdf
b) https://www.spring-nutrition.org/sites/default/files/publications/tools/spring_context_assessment_tools_all.pdf
c) several peer-reviewed articles were also published, that could help answer your questions:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8466390/
https://biomedpharmajournal.org/vol13no2/knowledge-attitude-and-practices-regarding-infant-and-young-child-feeding-among-lactating-mothers-from-rural-areas-of-nanded-maharashtra/
also, there could be something of interest in the GNC Global Indicator Registry;
https://ir.hpc.tools/
Thanks and I hope it is helpful
Best