I'm sorry I only saw this today.
For the 3min/10min, this applies to both the non-busty and busty versions of the weapon card. (So using the non-busty for 10 min will unlock the busty version)
Regarding the swapping weapons, I was thinking of adding this before, but I failed to make it work. I want to add the ability to swap weapons sometime in the future, but I can't make any promises.
274 days ago(+1)
This is a bug. Thank you for reporting!
And sadly, yes, Busty ones only have different art, but the function is the same. (The one with differences is between basic and naked, where basics have bombs while nakeds have waves)