I have witnessed the same thing happen to oil pump drive gears on two different occasions. One was an MHG+ARP bolt but otherwise stock unknown mileage JDM 7M-GTE longblock on a CT upgrade, and another was a semi-built engine (OG HKS 264's w/1SZ-FE shimless buckets, valvesprings & retainers, ARP head studs, HKS stopper, coated J&E pistons w/ ARP rod bolts & new Toyota rod & main bearings & new Toyota oil pump)
The spokes just came apart on both. The bolt was properly torqued and the outer ring itself was fine. The spokes all broke in different places, too.
Might be a worthwhile thing to make, but you'd have few if any buyers for it.
Stock crank pullies on both engines, and I know the timing belt tension was set correctly on the semi-built engine and it was checked again less than two days before it failed. Never saw over 7000rpm.