Sounds like you want the Host field to be set to "*" whenever the Model field changes.
You could listen to changes in the Model field and force the Host field to "*" whenever that happens. However that would also make links/drilldowns to the dashboard be unable to set Host to anything other than asterisk, as all other values would get clobbered during page load.
Should you want to take this approach anyway, you could create a JS file in appserver/static and include it with <form script="myscript.js">:
require(['splunkjs/ready!'], function(mvc) {
var tokens = mvc.Components.get('default');
tokens.on('change:T-Model', function() {
tokens.set('T-Host', '*');
});
});
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