I'd know more if I had actually done it. I have not. That gizzmo on ebay looks like a simple aux. lamp relay, no? You've already got plenty of lamps...besides the CDN DOT may have a spec on the size of lamp.
I found the link for what appears to be an easy DLR tweak.
http://www.whiteson.org/boxster/mods/drl/
I lived in T.O. for a couple of years and an equal number in Detroit (where electic door locks seemed to std. even be on Yugos) in the 80's. Guess which was more civil?
jim