Alex90,
That, and several other possibilities were considered but ultimately found lacking. The idea of adding just a few lines of code to solve a problem is compelling, but we have to deal with lots of possible manifestations of the problem whilst avoiding the system becoming bloated with checks and filters. The optimum solution is for the actual publication of these NOTAMs to be such that existing filter tags naturally direct them to their target audience.
I posited that if these NOTAMs are intended for commercial operators that might fly near these areas, then it would probably be optimal to simply publish them as IFR only NOTAMs (there is a section in the Q line that defines this)... but it was pointed out to me that a) it is perfectly legal for a flight to be planned and started VFR in the UK, and later become IFR, and b) that such an operator might not tick the "include IFR NOTAMs" in whatever software they use, because for the entire duration of their flight within the UK FIR, they are technically VFR. [attempt_humour] Also, c) if you don't warn everyone about absolutely everything then anyone can sue you for absolutely anything! [/attempt_humour]
This might seem a bit silly, but these decisions are made assuming that all operators use the official UK briefing service which is naturally UK focused... It makes sense when you squint at it from that perspective.