Not with the default console. If you download this script through the script manager though, you can just draw a blob of (say) INSL and issue the following command:
tpt.all():set("type", function() return math.random(1, 100) > 50 and "brmt" or "dust" end)
A shorthand for that is
tpt.all():randomise("type", { "brmt", "dust" })

Then add :eq("type", "brck") after tpt.all().