I've since switched to Swiss meringue for my buttercream, heating the whites and sugar over simmering water until +/- 160F
Yes, your creme anglaise is pasteurized at 82C
here's a chart for dairy products: https://www.idfa.org/pasteurization
these topics have charts for eggs:
Don't know about pasteurizing without cooking. I recently renewed my food handler's permit and I swear they said eggs only have to be cooked to 145F, which quite surprised me. But unless you're in King County, WA, defer to your own local authority.