Pasturizing soil with water

Hi all. [If there is a better place to post this, do tell me, as it is apparent that Im too noob to post correctly]

Got a crappy male (that I'd rather use as organic fertilizer), but I was keen on reusing the soil (100% organic), as it is still packed with both macro, and micro nutrients. Problem is that there are worms in it. Although they are relativly benign, they are many, and likely to be nibbling of the roots, however little.

While heat-treating the soil is well known to work, Im skeptical of the smell it can cause in the oven/microwave.

Thus, my real question is; Since the worms tend to surface under slow, prolonged watering, it clearly suggests that they're not to keen on being submerged (similar to earthworms I think).
As Im not going to have a plant in the infested pot[edit], I figured that if I put the pot (which of course, has drainage), or just the soil in a bigger bucket (without drainage), and fill it all so its submerged in water, the insects/worms will eventually drown to death (muahaha)

,,, but there is the issue of diseases, especially related to fungus. Anyone know if this is a bad/good idea?