There are two solutions:
1. Provide two versions of the mix to the mastering house: one with and one without Warmer on the master, at the same time please make sure that Warmers on groups are not working too hard splashing peaks. Ask mastering engineer to mimic the sound of your preference (with a Warmer on master)
2. Adjust Drive on every group and the master to sensible limits. Then use the Mix knob to make peaks getting through the VintageWarmer.