I don't think that would be enough. There would still be a magic number of them that would overwhelm anything, which is the core issue.
ECMs...point defence. If you're in a fast shipping, you should be able to avoid dumfries. Seeker Missiles are relatively slow firing and have a short clip.
Also forget the size of the missile relative to the ship, splash wouldn't be that much of an issue and I have yet to find someone sniffing my tailpipe dumping dumb fire into my backside as I won't let them lol.
A simple solution rather than nerf nerf nerf nerf nerf nerf would to allow synthesis of heatsinks, increase the effect duration and the amount of heat absorbed along with either making them immune to heat damage or buffing the integrity.
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