Twit and other Node libraries don't always quite drop into Meteor's reactive architecture right out of the box. Luckily Meteor makes adapting them super-duper easy with wrapAsync. It was so easy that I naturally tried all the more difficult ways first! Since I didn't find a nice gist or StackOverflow example, please enjoy this one.
In the template -
{{#with pos}}
{{#if ready}}
{{> singlePosition data }}