A summoning or reverse summoning can't save the user from kamui

[FlemSmack]

You can can be removed from Kamui dimension via reverse summoning, or FTG to a seal out side of the dimension.

 

[KidGamer65]

You can can be removed from Kamui dimension via reverse summoning, or FTG to a seal out side of the dimension.

Its already been stated all S/T Ninjustu aren't connected and Obito had knowledge on FTG and knew that if he warped Minato it would be over thus FTG nor Reverse Summoning can save you from the Kamui dimension.