I'm not even totally sure that it is possible at all now. I thought a rune blade was 3.25 or slower, which would mean that 81% H(L or M)L was the cap, meaning you weren't looking for overcapped properties. Now that I see that a rune blade is 3.0, that means that 80% hit leech is overcapped. (cap on a 3.0s speed is 75%).
I know that 2 overcapped properties aren't possible with anything less than an agapite hammer, and even with agapite, in 100s of attempts I don't recall ever getting 2 overcap. My suspicion is that if it is possible at all, 1 in 10,000 is still a reasonable idea to have for your chances.
Which is to say, that it isn't even practically possible. The ~4000 valorite hammers you'd need to make these 10k attempts mean you need 8,000,000 valorite ingots to acquire them. At a going rate of 1,000 gold per val ingot (probably low), that is 8B in raw materials.
Not to mention the need for 4000 LBODs with plate (any will do, they all bribe to 20 exc val...) If the going rate for SBODs is 1k per BOD, and the ratio of SBOD:LBOG is 100:1, then each LBOD must be worth 100K. Each plate LBOD then is 106K, not including the cost of bribing them up to 20 exc val (not cheap, at least several 100k per bod). Lets say, then, that each BOD is worth 500k by the time it is ready to be filled to turn into a hammer (this is probably low). Then that is another 2B in deeds. Since we already know that valorite ingots are scarce, I wouldn't want to lose any to making regular items and needing to re-smelt; so I will need to use Ancient smith hammers. I believe that 80 items per deed will need to be made with Ancient hammers. That is 32k items. At 500 uses per hammer, that is 64 various Ancient hammers. The problem here is, that all these hammers will need LBODs to fill (can get +10s with smalls... but they need val ingots, which we already need), which is a lot of work too. So lets assume that we can find each of these hammers for 200k - this is another 12M in raw materials.
Now we are up to 10B+ in raw materials.
What is a fair markup for labor of turning these raw materials into thousands of runeblades?