Yeah no way is that remotely possible!
That said, one of the BEST places to watch the fireworks in DCA is at PP on the Screamin side! Its pretty cool to watch the fireworks pop above TLM building! Sure you are not getting the full 'show' like you would at DL, but if you just want to watch the fireworks pop, then thats a great place to do it!
But if you want to see it in DL and do WOC in the same day, then yes try and get WOC tics for the second show but its STILL going to be tight and to be more honest with you you wont get the best views of WOC if you show up less than 30 mins before show time.
The BEST advice would be to see one on one day and the other the next day. If you are only going on one day I understand that, but its really hard to do both of them on the same night.....UNLESS you decide to do WOC standby next to TLM building and honestly that is a GREAT spot to watch it from. No tickets, waiting an hour in line for a 50-50 decent view where TLM standby line you WILL get a great view and still see 90% of the show easily!