Sort of. Here is a one-keystroke + one-click solution.
First use your text editor to open eq2ui_inventory_market.xml. Insert the following line of code onto line 3 (just after the first <Page line):
<Page Name="Relist" OnShow="Parent.MainPage.TabPages.SellPage.SelectedItemFrame.CommandListUnlistItems.Press=true Visible=false" Visible="false" />
Now make a macro:
For now, drop the macro icon onto your main hotbar so you can use a single keystroke to activate it.
Next, go to your Broker container and mouse-click (highlight) an item that's been de-listed. With the other hand press the keyboard shortcut key. Mouse-click the next Broker item, press shortcut, repeat. Not perfect, but fairly quick and semi-painless.
You can leave the extra line in the Broker file for later -- no harm done. Also note the macro is just pressing the "List item for sale" button which is a toggle -- if you use it on an item that's already listed, it gets de-listed. Just press the keyboard shortcut again to toggle it back for sale.
And just a random commentary: These de-listing episodes are not removing all the items priced out of reach in the billions, which leaves those items at odds with the new Broker rules. So it's anyone's guess as to why it's being done.