Custom block mounting question

[Stargaze obama]

I have created a custom gpu block which is a repurposed cpu block because there's only a single rx570 block available and it's 6x the cards value (value before cryptocurrencies shortages) anyway, to mount this block the standard m5 bolts and nuts do not fit through the holes where the stock cooler is mounted, however I found some fan screws that are a perfect fit and actually thread the pcb, so I wouldn't need nuts, the original cooler didn't use a retention bracket so would this threading of the original holes be a bad idea? It threads around 0.3 mm or so and doesn't interfere with anything, would this be a bad idea? After some testing on an old card I found I was unable to pull the scree out with maximum force from my hands