Nonprofit Security Grant Program Improvement Act of 2022 This bill modifies the Nonprofit Security Grant Program of the Department of Homeland Security and reauthorizes appropriations for such program through FY2028. The Federal Emergency Management Agency (FEMA) must establish an office, headed by a senior FEMA official, to administer the program. Office responsibilities include those related to outreach, engagement, education, and technical assistance. FEMA must also publish grant guidelines and may prohibit states from closing application processes before the publication of the guidelines. FEMA must seek to enter into a contract or other agreement with an independent research organization for the conduct of a study that analyzes and reports on (1) the effectiveness of the program for preparedness against terrorism and other threats; (2) the risk-based formula and allocations under the program; and (3) the risk profile of and any identifiable factors leading to the low participation of traditionally underrepresented groups and states under the program.