Well thank you all for the succinct answers and insightful replies. In the end, while I did use the thiessen polygon and other interpolation methods, I ultimately calculated the average space between each points (20,000) and converted the points into raster cells instead. Regarding the projection/GCS, I actually split the data roughly using the UTM divisions (not an ideal result), but thanks to everyone who answered. Indeed, as this is based off of Canadian government data, the best method may be to consult the source directly.
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