Reflagging (and re-painting) minis

I am soon-to-be in a quandry.

I will be spending Too Much Money on GZG NI minis in the near future, 
to (re)build my fleet. For good or ill, I have a sizeable (for me) 
NI-flagged fleet made of Brigade Minis. Re-flagging them by general 
shape not really too much of a problem, some of them have in FSE-ish 
planforms, some are NSL-ish, etc.

The real problem is that I like the paint jobs on many of them (or at 
least I don't think I could do much better with a clean slate), but the 
NI insignia and hebrew letters on them will be inappropriate. They are 
usually white letters/symbols on the darker (blue mainly) paint job. 
I'm pretty sure any attempt to paint over the white would be garishly 
noticeable. Are there recourses that don't involve stripping and 
re-painting?

Noam

"It is I, NRI"