Okay, pretty cool that you are trying it out.
I got some more information from Dave.
For background information about mycorrhiza he shared this link:
http://aggie-horticulture.tamu.edu/faculty/davies/research/plantstress.html
And he answered my question about the water treatment and harm factors:
“Mycorrhizae can be used with synthetic fertilizers. They prefer organic. Keep the phosphorus low. Tilling is also bad for Myco. Spraying boiling water or steam on weeds will not harm Myco.”
So boiling water treatment should work out
No Tilling
Low phosphorus
Other fertilizers are ok