What are some good templates or best practices for when to gather input and how to incorporate (i.e. whose feedback to incorporate vs. ignore, etc.), especially as it relates to a timeline?
Value Stream Mapping, especially documenting the current state, is an invaluable tool to identify key stakeholders for the project and to see the work required to create the future state.
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Once key stakeholders are identified and the current and future states are mapped, hold a scoping meeting with all stakeholders (functional and technical).
Document the decisions related to in-scope and out-of-scope elements for the current timeline.
Identify who is responsible for the in-scope elements and the delivery timeline.
Keep the document in a centralized location where it can be referred to by all stakeholders.
With those 2 tools, you can:
See who is impacted by the changes (whose feedback to incorporate);
What the agreed scope of work is (whose feedback to "ignore"/save for a later project phase).