Something like this? 
It would require redrawing the sprites... and it still might be difficult to get the same look. I wouldn't mind doing a pack like that in the future, but it'd be a lot of work to redraw every sprite in this pack and I don't have any use case for it myself.
Of course, you're free to redraw them yourself, even if you just rotate the sheet and draw over them to make them look right. You can also use the sword I just posted in this comment above as a starting point or as is (I would recommend trying to make improvements to it as I just drew it quickly).
And I'd like to ask in case I do a pack like that in the future, what's your use case for it? A sidescroller, UI elements, or something else? Why did the angled ones not work out?