is it possible to have two options for viewing html mail?

[Globe Trotter]

Lots of people send me mail in HTML format (even though I do not like it). I have the following set up in my .mailcap:

text/html; w3m -I %{charset} -T text/html; copiousoutput

so it converts things using w3m more or less okay, however, I am wondering is it possible to have an option for viewing using midori/firefox for the cases where w3m is not enough?

My thanks in advance!