i think it will work fine for that. I took a look at the info. And the way I would look at it.. worse come to worse.. if it doesnt work you already set up all the lines and routing to slap a premade filter in its place and you can reuse the activated carbon in the metal filter so the most you are out is the 5 gal bucket and lid setup if it doesnt work.. all the other tubing and fan and stuff you can still use for the real filter.. Id go for it.

and let us know how it works if you do!

and if it matters i was an industrial mechanic for 6 years so.. i kinda have a decent idea about improvising

oh and i would reccomend using activated charcoal.. instead of regular charcoal but only if regular charcoal doesnt give the desired result.