Merchant Tabs should stay Premium in SSF variants

I don't know how hard this would be to fix, but:

I converted two premium tabs to merchant tabs. Very happy with them so far.
I checked on my SSF stash and found, as expected, that I had lost those two stash tabs in SSF as well. Unfortunately, merchant tabs don't have any use in SSF, and it would be nice to still be able to use those as storage tabs in SSF, where I need more storage since I can't just use the market to pick up stuff. (I need to store more mats and more bases to work on them with.)