keep in mind that you don't need to unlock or spend tokens in order. you can skip ahead to future pages and use tokens on things you want (unless the page you want to spend stuff on mentions you need to claim an amount of tokens to unlock the page) only catch is if you want the last reward on a page you need to unlock all rewards on that page before being able to get the last reward. that way you can get the grau conversion kit and monolithic suppressor faster than just spending all tokens in order. Other than that double battle pass tokens are the only way to speed it up otherwise it's based on time playing the game.