I started looking at doing this and then stopped… Here’s why:
ICRPG and EZD6 are two sides of the same coin IMO. ICRPG is a bit more crunchy, but that’s only in comparison to how slim EZD6 is.
If you really want to combine them, then best bet IMO is to drop effort, stick with TN and Stats from ICRPG, and use BOONS and BANES instead of EASY and HARD. Hero Coin stays put, no need for the Hero Die as it’s most likely inspired by the Hero Coin anyhow, and they accomplish the same mechanical benefits. Karma becomes +3 to a roll for each used for a quick and dirty math conversion from a d6 scale to a d20. Change Hearts like this: 1 Heart = 3 Strikes, again a quick and dirty conversion.
Magic you can use Free Form magic as is in ICRPG already, just use the circles from EZD6 as the basis to limit it a bit like it is done there.
As far as Types vs Paths, this can either be a manual conversion, leave it as is and only convert EASY bonuses for ICRPG types to BOONS, or use EZ Paths and leave out the miraculous saves and armor saves and use Defense as is in ICRPG.
Hope some of this helps in your endeavors!