Your question does not provide any further details as to what the exact purpose of these SSMs might be. Under such circumstances I believe you must understand what SSM is in its truest sense and then go for hiring process. You can check out these links: https://www.umsl.edu/~sauterv/analysis/F2015/Soft%20Systems%20Methodology.html.htm
https://www.diva-portal.org/smash/get/diva2:408752/fulltext01.pdf
But still If you choose hiring experienced professionals as an option you can use this link: https://welcometossm.com/work/employment-services/
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath