Like GeiyserQ said,you are down to about 6.5 lbs cooked packer,which is about 25 ,four oz servings.
They try to get/hold that size for me,as that is what we use for comps.
Depending on how you trim it,you probably will have to bend up the tip.
At 225º in the Smokette,you are probably talking a good 70 mins/lb.
I'd try to push it to 195º internal.
Put enough newspaper in the cooler,and it will hold fine until lunch.
When you pull it from the cooker,wrap in plastic,with up to about a cup of beef broth/bbq sauce/coffee/wooster,as it will hold.
Wrap tight in foil.
Just a thought.