For a particular form, you could open the blueprint, do a find and replace, then update the form from the revised blueprint. Press Command-F in the blueprint dialog to open the find/replace panel.
Or you could do this:
selectobjects objectinfo("font") match "HelveticaNeueDeskInterface-Regular"
changeobjects "font","Helvetica Narrow"
To do this for all forms in a database you would need to write a program that opened each form, ran the code above, then closed the form. This could be done in a simple loop.
By the way, Panorama 6 doesn’t store any font names, it just stores font numbers. When a database is converted from Panorama 6, it asks the system what the font name is for each number. I think maybe HelveticaNeueDeskInterface-Regular is what you get if the font isn’t installed. Could that be the case? Anyway, there is no change in Panorama that can fix this, it relies on the system to tell it what name is associated with the font number. The good news is that Panorama X stores fonts by name, so once you get the fonts set up, they will never change.