help with icons

Okay, I'm throwing this out to the crowd: I have a system in place that allows specialists to do spontaneous casting with spells in their specialty school. Like, your Illusionist can memorize Acid Arrow and Blur and Web; but if you get into a tight spot you use a special ability, and suddenly you can choose from between Blur and Invisibility, and you cast Invisibility to escape the trouble. Then your memorized spells will go back to Acid Arrow/Blur/Web (minus the slot you used to cast Invisibility - so if you used the first one, now your memorized spells will be Blur/Web).

I think it's super cool. But I have one aesthetic issue: I need icons to represent each spell level. So, when you use the "spontaneous" ability, all of your memorized spells have their icons converted to a generic "cast a specialty spell of this level" icon. Acid Arrow, Blur, and Web will all look like this:


Once upon a time, DreamSlaveOne over at Gibberlings3 made these icons for me, for a different mod. Unfortunately that mod only went up to 6th level, so I only have 6 icons:


I'm no good with image editing... does anyone want to pitch in and help me make three more of these, for spell levels 7, 8, and 9? I guess by grafting roman numerals VII, VIII, and IX into them?

I have them in white as well, if that's easier to work with:


Alternatively, having read about the application, does anyone have other ideas for how to easily and clearly display 1) that you are doing spontaneous casting, and 2) which spell level you are going to choose from?

Here is a link to a video of the spontaneous casting in action.

In this video Imoen is an Illusionist with Spook, Reflected Image, Grease, and Armor memorized. (Armor is a 2nd level spell in this install.) She uses the spontaneous toggle, and now she has 3 instances of "Spontaneous I," and 1 instance of "Spontaneous II." She toggles the spontaneous spells on and off, to show that you can go back and forth; and then she casts Invisibility, which she did not have memorized up to that point. Afterward, Armor will no longer be momorized, because she used her only 2nd-level slot to cast Invisibility.