The develo kit was found in the wild quite some time ago, so I'm pretty sure that the official tools are already available to us. The only thing the average developer doesn't have is the hardware, so the official tools don't do us much good, but that doesn't really matter... the huc/pceas toolchain is better than the official devkit in some ways anyway. What makes things a challenge is HuC's bloat due to a lack of optimization and way too much reliance on macros. Hand-optimizing the resulting code fixes those issues, but you need to already have extensive knowledge of assembly to do that, and at that point, you might as well just code it in assembly anyway.