Would love to see your torque curve!
Steer clear of single mass conversions.
As already said, get the Helix organic clutch + new dual mass FW. Clutch is £500, DMF is £255 and then labour on top. Not cheap, but there's no other option really. Yes a standard clutch will handle it, just, for the first half of it's life, and then it will slip again. With that much torque you'd be looking at 30-40k miles max, then it's going to need doing again.