Looking for two-column email theme that doesn't convert to one-column on mobile

All the responsive email newsletter themes I have found seem to convert a desktop two-column content to one-column layout on the mobile email reader. I would like to have 2 columns in the mobile layout and maybe 3 columns on desktop (so on desktop it’s 3x2 and mobile it’s 2x3.)

Can anyone direct me to a theme that supports this? I am using MailChimp – but the built-in responsive two-column layouts will always convert to one-column on the mobile.