I will also say that an angle grinder is cheaper than you might think! My $10 Harbor Freight one has served me for 7 years. Sure it heats up and vibrates like mad, and I had to replace the cord once, but it gets the job done.
__________________
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.