You can bind some keys in insert mode to move to the next word like vim-rsi plugin does making vim readline binding aware or use built-in arrow keys.

Or you can `RWed<C-o>/11<CR>12` to replace Tue to Wed, goto normal mode for a single command, search for 11 and continue replacing 11 to 12.

For your example though I would just go for `cwWed<ESC><C-a>` -- change word Tue to Wed and increase next number by 1.