My experience has been with the EZip type non-hubmotor wheels. (EZip Wheel Re-builds
Most all my recommendations are somewhat applicable to all wheels.
Redrilling Spoke Holes
#1 Size of hub holes 1/8".
#2 Size of wheel holes 3/16".
#1 Plan on a pattern that puts the torque on the outside spokes.
#2 Take into consideration torque on front wheel with disc brake(directionally opposed to motored front wheel.)
#3 Ignore disc brake on rear motored wheel
Motor on rear wheel should take precedence over disc brake considerations, rear wheel (dual braking) supplies only 20% braking power of front wheel
#4 "Rim" brakes should be ignored, as a spoke factor.
#5 "Important" - Lace all spokes into hub and align ... BEFORE beginning to insert into nipples.
12ga spokes do not "flex", they will bend
I did one side then positioned by making a run with electrical tape, a wrap at each spoke cross.
Then did similar with the opposite side.
Then began threading into nipples
#6 Coarse alignment - Equally thread nipples, I threaded till the thread was covered.
Then I tightened each nipple an equal number of turns.
Repeat until nearly tight
(I used a quality variable speed cordless drill with a straight bit. )
Note: put dot of "white out" or similar , on straight bit - easier to count turns!
Only if you have proper size spokes! Typically, each side uses different lengths!
#7 Final adjustment should be done on the bike it will be used with
#1 Spokes are now stronger than wheel?
You might pull the stronger spokes right through the wheel?
So ... washers!
#10 SAE "stamped" washers have a nice concave side, that works nicely with 12ga nipples.
Aluminum alloy wheels don't particularly like steel, even zinc coated steel washers, against them, so I ran 2 wraps of duct tape between.
I planned ahead ordered spokes of +2mm length ... not necessary, as it turned out, plenty of threads with shorter length!
#2 Spokes keep breaking at elbow, hub flange too thin, ... too much spoke "flex"? #4 SAE washers work nicely, and look impressive!
Stainless steel washers recommended!
SAPIM STAINLESS 12G SPOKE