I know that the build will depend on the taste of who is doing it, some stuff i want to clarify.
You can pretty much have most of the skills maxed, except the useless or less useful ones by going Alch C3, you just need to organize your priorities.
As you can see, my progress is pretty simple, will led me to where i want and will have 4 spare points for Brinquetting, as you pointed out, it is another dumb RNG crap IMC invented, the only possible good thing about it is the attribute to change the weapon skin.
Gem Roasting is or will be a must to be maxed, reaching Lv 10 gems is not that hard, take a bit of time, but you can do it.
Combustion is a waste of SP (skill points) don’t cause much damage, waste silver or item dropped and you still have the risk of blowing something you need.
Digging is another crap thing, i picked it up thinking it would help Combustion, but with the large radius of the auto loot function, it became useless same way, but some say you can dig some of the required material for homunculus Magnus Opus recipe, even so, you can use the same skill to transmute the same items.
I decided to put Awakening in max Lv since we never know if IMC will resolve change mob stats based on item rarity and star numbers.
And Alchemistic Missile was an extra, not sure how much damage can pack in the new content, but since taking Linker (C1 or C2 (i preffer C2 and you are certain to get party with it)) it might increase the damage output, also, in low level areas where you will go farm, will help in killing certain elites (Pendimire or w/e it is called at DBF) since they are sure or at least have a 50% chance of drop the material we need.
As for stats, i think a normal offensive wiz stats would work fine, 100 CON and the rest in INT.
Gear doesn’t matter much as long as you can survive while fighting with what you have.
