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Sure, this is how many people do it. I would get your param's where you want them using your two part, and then start your kalk drip to see if it will keep up with your demand between WC's.
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3675+3677&pcatid=3677
I've got to pick the Ravens, since there are so many local's playing for them, i.e. Joe Flacco is from Audubon, NJ, Ray Rice played for Rutgers, John Harbaugh was a DB's and special teams assistant coach for the Eagles for 9 years.
Here are the two pieces I used to do the mod. I think you'll find these sizes will fit many different in sump skimmers. I had some extra pieces of PVC fittings I got from Tom (tgee), and found that if I used a 1 1/4" to 1" reducer, and a 1 1/4" x 3/4" Tee, it worked like a charm. Drilled a...
Kalk is a good suplement, but used by itself, may not keep up with your demand, since it will be limited by your evaporation. I use it my top off, in conjunction with my two part, since it utilizes some of the CO2 in my system, and keeps my pH in line.
Looks like a bung tap/drum faucet, but I don't know where to tell you to find one.
Maybe here:
http://www.bascousa.com/drum-pumps-and-faucets/faucets.html
What's in your RO/DI water? Are you certain of the accuracy of your test kit? Have you tried dosing kalk in your top off? If your Alk dropped about 50ppm, you should see your Ca drop about 20ppm, allowing for a certain amount of noise in your test kits.
The uptake of Ca and Alk by "stoney"...
Its very possible that it was just used by your livestock. The uptake of Alk to Ca by stoney corals, coraline algae is 5 parts of Alk to every 2 parts of Ca, and there is less Alk in reserve in your system, so it can go down quickly. Did you measure your Ca last night too? Allowing for a margin...