Slow down. That is not a 1:2 halyard described by T-shan because it is a back-to-back block.
You are right, it is not a 1:2, I was mistaken. The only reason for this system on the viper is to move the cleat onto the mast while still keeping it a one line operation.
The way I was thinking about it you can probably do a 1:2 on the halyard:
* You set the halyard from the head of the spi, to the top block, down a bit around another floating block (let's call this the "spi halyard block") and up the mast to a fixed point somewhere. The block should be as high as possible but still allow the head of the spi to enter the snuffer. This can be a stripped line as it will never see a cleat or a hand.
* you set a single line from the spi tack, to the front of the pole and then back along the pole to finish in a single block ("the spi tack block"). This block should be almost touching the main beam when the tack of the sail is at the pole end. Again, a stripped line.
* You then route a third line starting from the spi halyard block, down to the main beam pulley, forward along the pole, around the spi tack block and then back to the beam cleat. Followed by a little circle around the trampoline and into the snuffer to the three patches.
Now when you pull you have a 2:1 on the tack and a 1:2 on the head. This should give you half the distance snuffer/top pulley plus twice the length snuffer/end-pole for the retrieval line. The issue there is I'm not sure it is long enough to allow for the spi to go all the way up, some additional length on the trampoline when the spi is down may be needed. If you put a back to back block on the tack line, like I'm assuming Wayne has (I didn't look wednesday Wayne, I have no clue what you were doing

it is even worse, as it will be a 1:1, and you 'lose' one length snuffer/pole for the retrieval line. To compensate the missing length should be on the trampoline when the spi is down.
As for the burns on the spi, I have some too. I'm using a regular dyneema line with a polyester cover. I don't know what to use to avoid the burns while keeping the line nice on the hands...