I'm building a character for organized play. The design goal is to create a versatile support caster that's more of a Swiss Army knife than a straight blaster. The build concept is a variant human Sorcerer (Bronze Draconic) 17/Warlock (GOO/Tome) 3 that has a more utility-focused spell list.
Combat capability will be primarily Eldritch Blasts, with a handful of spells like Shocking Grasp, Chill Touch, and Chromatic Sphere for their utility and damage type versatility. Only reason I went with Draconic over Wild Mage is because Wild Surge frequency is completely controlled by DM fiat, which makes it a bigger gamble in a gameplay environment of using one character at many different tables. Until there are AL DM guidelines for Wild Surge frequency, the more thematically appropriate subclass just isn't as mechanically sound for organized play.
I have most of the build done, except for three things. Two of the questions are A vs B, while the third is more of a yes/no question. I'm more concerned with low level viability, as every AL character starts at 1.
What order should I take the classes? SWWWS+ or WWWS+? Doing the warlock levels first makes sense in terms of theme and dip optimization. However starting with a single level of sorcerer before the dip gives a higher starting AC. Would it be worthwhile to use Spell Sniper to pick up Eldritch Blast if I started with the sorcerer level? I'm open to other feat suggestions. The only limit on the first level feat is that it needs to be useful from CL 1-6, as I won't get an ability increase until CL 7.
Vicious Mockery vs Dissonant Whispers? Which would be the better choice as a source of psychic damage? I know that it isn't a common vulnerability, but it's the only type that a raging 3rd level bear totem barbarian isn't resistant to. Plus it's useful with Telepathy/Detect Thoughts to discreetly counter Feign Death.
Is there any way of adding a source of radiant damage to my spell list other than using the tome boon to pick up Sacred Flame or waiting until Sorc 11 to learn Sunbeam?
I'm aware that I lose an ability score increase by not taking a fourth level in Warlock. The main tradeoff of not taking Warlock 4 is eventually getting 9th level spells, albeit at CL 20. My planned invocations for Warlock 2 are Agonizing Blast and Fiendish Vigor, replacing FV with Book of Ancient Secrets at Warlock 3.