The good news is that you can use both sauna/sweating and oral chelation. Some people in the Cutler detox support groups make an effort to get sauna on the day after a weekend " round" of oral detox. The hope is that sweating will eliminate some of the residual heavy metals that were mobilized by the oral chelation.
Some people seem to also need support for adrenal cortex when using sauna. One of those hormones, aldosterone, is involved in regulation of sodium and potassium.