With the right fixins, and possibly a new head (can't make out what it looks like, b ut the other Indy toys are fairly generic I know), it may make a nice custom...
I've seen people do wonders with Hasbro 12" SW figures and a Dragon body, and a head or headcast from a decent toy line of the same actor (Like Matt mentioned the cast of Harrison's McCoy likeness).
Of course, I think you can order the parts you want that are almost as good as Toys McCoys from some of the custom "Joe" shops if you looked around... Cotswold used to have that crap I thought?