[minminRW]

To go to Bandai Museum from Ueno, it takes about 1h30m.
It is located in Tochigi prefecture.
e.g.(search result "Ueno to Omochanomachi/to get by 10AM")

上野 Ueno
常磐線快速(取手行) Joban-line(JR)
07:53～08:04 160yen
北千住 KitaSenju
きぬ103号(鬼怒川温泉行) Express"Kinu 103", Tobu-line
08:10～09:07 1030yen plus express 1200yen
栃木 Tochigi
東武日光線(東武宇都宮行) Tobu-Nikko-line
09:10～09:32
おもちゃのまち　Omochanomachi
(Bandai museum is 10 minute-walk distance from Omochanomachi)

I think you cannot visit Bandai Museum and Disney in one day because they are located almost oppsite sides from Ueno. Moreover you might need whole one day for Disney because of its vastness and jam-up.