Personally, I would not have any issues with ANY meet and greets outside. I am not worried of the virus being spread with short (and potentially still somewhat distance) close contact with a character outside. Especially with kids (who are VERY minimally affected by the virus). I think the jury is still out on how easily this thing spreads via the air .. especially outside.
Waiting in a queue in an indoor space is another thing (confined space, air conditioning blowing and recirculating the air). But meeting Buzz in Tomorrowland, Merida in her alcove, the Toy Story Gang in TSL or any characters on the Town Square should be good. Have sanitizing stations before and after you meet the character. Treat it like a petting zoo.
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Granted outdoor M&Gs are pretty rough during the summer, but that would keep the lines down, thus less crowded and more distant.