That'd be shitty, you'd still have to find 2 primals to shard for every cube craft and they don't exactly rain down on you
Need to shard 6 primals 1+2+3 to get the three potions and then unlock the final ability which gives you double primal drops.
Raxx's suggested upgrade list, still has you open the initial Challenge Cache and then hunt for any diamond gem to unlock the 2nd power to craft and immediately equip max level gear. 3rd power needs a GR key so requires 70, 4th power requires a set helm so that will take a bit but you get extra movement speed. 15th power is gatekept with a Challenge Cache, if you're good enough to get 1-14 by Monday you can use your 2nd for it.
A Your Kill Streak timer duration and reward bonus are doubled.
C Items have no level requirement.
B Pools of Reflection last for the entire Season and are not removed by death.
F +25% Movement Speed (Uncapped)
H Picking up Health Globes grants a shield for 5% of your maximum health for 7 seconds. Max stacks 5.
J Increases your highest elemental skill damage bonus by 10%.
O Double the amount of Bounty Caches that drop from completing bounties.
S Gain immunity to crowd-controlling effects.
R +15% Damage
V Elite packs drop one additional progress orb.
X Pets pick up and salvage common, magic, and rare items.
T Gain passability.
Z Double the chance to find a legendary item purchased from Kadala.
U Pets pick up Death's Breath.
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I +25% Melee Damage Reduction.
M Double the amount of Death's Breaths that drop.
L +10% Damage
K Increase damage against elites by 20%.
P Progress orbs from Nephalem and Greater Rifts are picked up automatically.
D +200 Damage
G Increase damage against elites by 15%.
W Increase damage done to Bosses by 25%.
Y Increase your chance to Dodge by 15%.
Q Reduces the damage taken from elites by 25%.
E +25% Missile Damage Reduction
N Critical hits grant resource: Mana: 15, Hatred: 5, Wrath: 5, Arcane Power: 3, Fury: 3, Spirit: 5, Essence: 5.