So, I couldn't find a thread discussion on this topic of twinborn possibilities.
I honestly dont know why I have it in my head that this combination could lead to some really interesting/power things. And I kinda want to talk to people about it.
So a steel allomancer can push on metals while a chromium feruchemist can store Luck to tap into at a later time.
This could lead to really cool trick shots and all around fun reading I think. And it doesnt help I have it in my head a character being of this type of twinborn and saying something along the lines of "I guess that was a... lucky shot" after they get out of a close scrap with someone.