Hi
Currently, 64-bit Raspberry Pi images appear more experimental than mainstream (e.g. not shown directly near the 32-bit images on the website), so we do not have any plans of releasing compatible cross-toolchains until we see this change. That said, if you are OK covering the toolchain building costs directly, feel free to contact our support with more details, and we can gladly give you a quote (we might be able to reduce/waive the fee if your company holds multiple VisualGDB licenses).