The foreign agents registry is a tool for transparency above all. There obviously is the Lobbying Act, which is very constrained and applies to very specific conditions. At this point, there's no alternative. The foreign agents registry would fill a specific gap in that regard.
Evidence of meeting #12 for Canada-China Relations in the 44th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was interference.
A video is available from Parliament.