Probably not.
There is no monorail between MK & Epcot. You have to take monorail or boat to TTC, then change & take other monorail to Epcot.
When we saw Spectro & fireworks last month, all transportation out of MK was extremely busy after the show. We even waited 1/2 hour before leaving MK & the transportation was still busy. You may very well have to wait 1/2 hour or more before even getting on a monorail or boat to TTC.