I think you can make it, but you might be rushing. Is there any way to work your schedule so you're dining in or near MK on Spectro night? And dining at Le Cellier on Epcot night? That would make it so much easier. If not, be sure to check into dinner on time (around 3:50) and be aware of the time while you're dining (you can always get dessert to go if necessary). Monorail to TTC and then monorail to MK will take approximately 40 minutes. You'll also need to allow time to get through security and the turnstiles, plus find a viewing location.