You have not provided enough information in your post. As a retired academic who has taught Strategic Management and Operations Management to MBAs and has industry experience, I am unclear about your statement, "I am very new to HR since majorly into transactional stuff."
Additionally, I am unsure about your reference to "painful and cost-saving (post effects)" and who the unhappy and resentful staff are. Your mention of re-establishing business models and facing ill effects of transition and transformation lacks clarity.
Clarification Needed on Business Model and Effects
Could you elaborate on the new business model being established and the reasons for anticipating negative effects? What specific questionnaires are you seeking, and what information are you looking to gather and from whom?
Recommended Reading
I recommend reading the article on Forbes titled "Hewlett-Packard Shares Dip After Sales Miss Estimates, Leadership Changes Announced," as it demonstrates how companies facing challenges often undergo changes.
Please provide more details to help us understand your situation better.
Best regards