I am actually working on a build that might partially be up you alley. I'm not posting it yet because I haven't finished a playthrough with it, so I don't quite know how it'll play out in the end-game, but you might consider a chanter to pick up the "their companion" invocation that grants energized. you can single-class it or combine with a party or multiclass that gives you further accuracy or crit bonuses. you also want ring of focused flame and helm of the white void.
the trick here is that many of the bombs tick periodically as a persistent aoe (not a hazard or a DoT), which means every 3-6 seconds they get an attack roll (most bombs tick every 3s, immolator and maybe a couple others tick slower). That means every time you crit with one of these persistent ticks, you trigger an interrupt because of your energized inspiration, even if the tick was only for like 3 damage (normally only the initial explosion of a bomb can interrupt). In addition, energized gives you a +2 PEN bonus that can help your explosives do better damage. ring of focused flame gives you +10 stacking passive accuracy with cinder bombs, sparkcrackers, stun bomb, and immolator (all count as fire), and helm of the white void gives you +10 stacking passive accuracy with cinder bombs (for +20 total), blister bomb, frost bomb, essence of imp spray, implosion charge, lightning bomb, sparkcrackers (for +20 total), and stun bomb (for +20 total)... basically the vast majority of bombs [though for half the game you won't have helm of the white void whereas ring of focused flame can easily be stolen after port maje]. out of all these options, cinder bombs are your best bet, because not only do they get the full +20 accuracy, they also are easy to make, easy to buy, and their affliction helps further ticks crit (blinding provides an effective +10 additional accuracy). but in harder fights you can layer multiple bombs and make it challenging for enemies to get much done. note that even though i listed sparkcrackers and stun bombs, it was only for completeness's sake - for this setup they don't have follow up ticks for interacting with energized.
you can also pick up additional supplemental gear to boost your explosives, e.g. firethrower's gloves gives you +2 explosives. lucero pet from FS might be worth it (-25% item recovery bonus).
if you really want to be bomb-focused you should single-class the chanter and rely on party members to provide further buffs (mostly a priest for aware and/or devotions plus acute for +1 PL. a cipher providing tactical meld can help in a pinch). this is because the invocation for energized comes pretty late for a multiclass. if you're patient, you can multiclass it with a fighter, who might be the overall best choice because of their easy access to intuitive (25% hit to crit) and conqueror stance (up to +10 non-stacking active accuracy).
like boeroer says, bombs won't really do that much damage - grenade and concussion bombs are the biggest damage dealers (maybe immolators too, but they have low PEN and it takes a while to scale up their damage competently) and they're not really going to win fights for you that much (in fact, because grenades and concussion bombs push enemies out of their explosion range, they are their own worst enemy for spamming damage bombs). but they can serve a fun utility and disruption role.