When you say "feed" you are talking about the feed of
juice into your coils, yes? Bottom feeds "work" because the coils are where the gravity (and wicking) allows the juice to flow. I don't know of any pyrex tanks/clearomizers that "feed to coils on top" (but I know that there's plenty that I don't know).
Have you tried or considered trying a Pyrex CartoTank rig? It's a different setup than a clearomizer, but to scorch one you really have to work at it (either let the tank and carto completely run dry, run a carto too long until it gets clogged up, or insufficiently prime the carto when you first insert it).
Or, when you say "feed" are you speaking about filling the tank?
I apologize that my questions are odd (or if they offend), but I am not 100% clear on what you are asking when you say "top feed".
I believe the OP is asking about top-coil/top-wicked clearomizers. The Smoktech Pyrex Vivi Nova clone is such a device. Not used one as my experience with Smoktech clearomizers in the past has been less than good (Smoktech Screw tank - aptly named).
And now I understand. Thank you (once again) Baditude. You have a gift for clearing up my confusion (which happens more often than I prefer.... my confusion that is. I am glad that you are here to clear it up!)