A possible interim solution would be to split the river into more than one multipolygon each with a single outer way. As this is how situations like this were handled prior to the advanced multipolygon proposal its is more likely to be supported in all renderers and editors.
What about just tagging the rivers as they ought to be under current guidelines, and then waiting for the renders to catch up, letting things come out wrong in osmarender for a while?
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