I would say that Alloy steering conversion isn't needed at all - in my SX3 I'm using std plastic parts and didn't manage to break it since it's release.
It's much more reinforced compared to old SX2 version and much cheaper than alloy version.
As far as Yokes goes - I used 12.5 degrees ones for almost all the time.
I also belive that you can upgrade old SX1 or older SX2 kits with steel gears upgrade for Cougar SV (not SV2), it should be cheaper than pinion and new shafts option. You won't have slipper adjustment on spur side though - can be sorted out with suitable grub screw
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