Wrote up a quick test script, for home testing, for a bigger EMP defrost. Yes, currently it is smaller than the 'blast' size and requires accuracy. The balance is that there was no distance check for a timer nor obstruction checks and it would be a full defrost always. Make an accurate throw and you are done.
The alt version, which I have to test out later, will be distance based and function similar to regular grenades or a flashbang. Twice the radius but the defrost timer is based on distance. Also it will check for obstructions. If you cant see the flare, or the flare cant 'see' you (same thing but matter of perspective), then you arent defrosted.
Which version is 'better' is a matter of opinion as always. And it will have to be a setting that applies to everyone.