Let me suggest that a simple non-nuclear alternative would be for people interested in Unicode symbols to use an editor that auto converts from Haskell Ascii to Haskell Unicode when loading and (of course) back again when saving. You can do that today. You can even pick your own Ascii from/to Unicode mapping. No need to argue about whether a symbol is prettier than another. All of this without forcing the rest of the (couldn't care less about record access syntax) Haskell community to have to deal with Unicode :-)
I tried this with an existing vim extension, but found it to be slightly buggy. It seems much greater effort to tell people to use a mapping - now everyone must learn how to configure/program their editor, and this may be impossible for some editors. I was under the impression that virtually every code editor and viewer supports utf-8. If you want to do mappings, it seems preferable to first use a new ASCII operator for composition, which can still be mapped it to a unicode dot.