I'd never considered the Assassin Bug as the name, but it does rather fit.
As to the upgrades, I'm someone who genuinely likes the mech, and I think there's a lot of focus on how it could be better that there's too little look at what it infact does well. I'd rather see the mech just become more of what it already is. In the Succession Wars, swapping the SRMs for MLs is just too tempting (same range, more power, and you can jump to cover to cool down if the heat gets to you) but I do like to keep the LRMs, just because so few lights actually can shoot past nine hexes and two to five points of damage can really worry a lot of lights in that era. Alternitively, just mount more armor and use it as a super scout. And, I'll confess, when I used one in my youth I just went all out and traded all the missiles away for MLs and armor, but it wasn't as flavorful as it should have been (even if it did become a sort of alternate Jenner F, which is never a bad thing).
On the modern Assassin, MMLs if avalable can't be ignored. I've never liked the AC5 (the Hermes II, Clint and Vulcan already fill that role in their ways). I probably would have just larger missile launchers, either a LRM10 or a SRM6 upgrade. There's already a super Cicada with an ER PPC (at 8/12/8, very Viper A like) so I wouldn't do that. Maybe keep the old (terrable) weapons and just mount IJJs? The jump jets were always the reason to take the mech anyway, since it was one of the few 7+ jumping options, so why not stick to that and make it one of the very few 10+ jumping options, and people will take it inspite of mounting some Shadow Hawk-eque missiles just because it flys.