I considered doing a similar mod myself, although as the only plate keyboard I have is without switches it's not an urgent task. It may take a little while, but not every job has to translate to an hourly rate. I cut my own stainless steel switch tools with a Dremel, it took a while longer than brass, but not a great deal longer, and if it can cut 1.2mm stainless, it can probably cut the plate steel, which is thicker but not stainless. Very interested in your results.
If you enjoy your craft, then even if it costs you $5 an hour instead of save you, its a cheap hobby. If you don't enjoy crafting, then every task you can't pay for is a sad chore.