Well.... TBH, this actually probably isn't tht bad of an idea.
Think of it this way, assuming you start your attack run at your max missile range (lets say you have something else providing your active sensor ping). lets round it to 60mkm for ease.
1 missiles fired once every 10 seconds, means 900 seconds to fire the whole supply (910 - 1,10 sec increment because you don't need to reload the first shot)
900 seconds @ 16,000km/s is ~14mkm. Assuming you started the run at 60, the ship will finish its firing at around 45m, and turn away.
91 shots out, which give or take a bit, would only fit about 50-60 equal sized box launchers. Which NEED a hangar to reload, as opposed to a collier which can support the OP's design without needing to be very much larger than the FAC itself.
Also to note, is that it will be in 91 separate target salvos coming in that need interception, As opposed to a single 60missile salvo, that the defenders fire control will have no trouble engaging.
Personally, I really like this idea, its kinda nifty, and I might be trying it out myself for the lulz, once 6.5 comes. Personal revisions I would make however.
Since I experiment the most at the ion tech it'd probably be around there.
Maybe stack a few launchers on the craft (4-5) with a tiny magazine with only a couple reloads, And build an equally sized collier, that makes the attack run with a handful of these craft, and can burn through the ammo supply in about 10 salvos rather than 90. This way your attack run is only ~160kkm, and your craft can turn back long before they made it anywhere near detection range.
Also by giving them a few more launchers of their own, this allows them to see other usage as AMM launching craft, if direly necessary (can feed off the AMM stock of a bigger ship, or collier)