Huge success! Wish I had done this a month ago! Here's an overview of the MDR process...

What you will need:
Tarp or plastic sheeting at least 15' larger than your pool dimensions in both directions.
Bottom drain and/or submersible pump
Garden hoses
Clean 5 gal bucket
Enough dichlor to get your pool to shock level (and eventually bring cya to desired level)
Poly quat (if your pool will take several days to fill)
Borax (and whatever other chemicals your tesing reveals you will need)
Taylor 2006 test kit (of course)
Something to keep the tarp from your vac ports/drain (I used a large plasic leaf rake... It worked to guard the sidewall vac port I used for part of the time. But you might need something different...)
Heavy objects to weigh down the edges of the tarp

Prep work (this is what I did for my setup... Yours might need to be different. Plan ahead and give yourself multiple options to add water and remove water):
1. First of all, I tested my fill water so I knew how I would need to treat it.
2. I tied a string to my pole and lowered the whole thing with the vac head attached to the bottom of the deepest part of the pool. I tied the other end of the string to the hose right abobe the skimmer so I could pull the pole and vac back up when I was done. I have no bottom drain so this was my backup method of water removal if the pump should fail or I needed to dump water quickly by vacuuming to waste)
3. I placed the submersible pump at the deepeat part of the pool.
4. Also, I put a garden hose in the pool after filling with water from a jet... This would be my syphon hose (we live on a ravine so gravity woul be my friend)
5. For my fill water, I connected hoses to both outside spigots... This doubled the rate of filling. If you have 3, use them all.
6. Finally I positioned the tarp over the pool with my daughter's help.

Process:
This part was pretty easy... After getting the hoses started filling water on top of the tarp and the submersible pump & syphon pulling water from under the tarp, i also pulled water through the side vac port with the pool pump (to waste). I used the pool pump until the water was just above the side port (about 12" below normal) then I shut off the pump. At this point, the fill was just barely faster than the pump and syphon, so it was fine to leave it awhile. As the water level got too high I would use the pool pump to remove water to just above the port again. This is where the rake came in... I placed it upside down under the tarp with the handle on the bottom of the pool and the tines resting on the side just above the port. It was at about a 45 degree angle. This seemed to keep the tarp far enough from the port to prevent it from cutting off the flow to the pump (at least until it was about 2/3 done).
The difference in flow rates was small enough that I could go 6-8 hours between using the pool pump to lower the water level again. this would be much harder if the outflow was faster than inflow... My submersible pump is very small and might be about the same flow rate as the water supply... Syphoning however was not nearly as fast as the supply.
When it was about 1/3 complete I pre-dissolved 1 lb of dichlor in a clean 5 gallon bucket (for my pool it would take 3 lbs of dichlor to get me to 15ppm of chlorine upon completion, so 1 at 1/3, 1 at 2/3, and 1 at completion.). I then poured this around the pool. Also, my fill water has very high alkalinity so I tried to keep the fill hoses elevated so that they aerated the water some as they filled the pool plus this provided some movement of the water since there is no other dcirculation during this process.
Almost all 13000 gallons had been replaced in about 24 hours from starting the hoses. Removing the tarp was a little tricky... My daughter was eager to get in despite the 71 degree water, so she helped from the inside. (it is worthy to note that the heat transfer from the old water to new was higher than expected. I thought I would be starting with 60 or 65 degree water, so 71 was great.) the trick is to get the tarp fully submerged on one end then slowly drag it to to other end of the pool where it is pretty east to remove once you get the hang of it. Once the tarp was out, we jumped in. Water was great (if a little chilly).