Looks like in order to do a proper injection test I will need Passmark's ECC Tester for $260 or MemTest86 Pro edition for $52. MemTest Pro can't even guarantee the software will work due to Ryzen not being very clear publicly what hardware is supported/capable or not.
`In general, ECC injection is not a feature that is normally accessible by end-users. Even if the chipset supports the ECC injection feature, details are often sparse and not described in publicly available datasheets. Consult the datasheet for your CPU/memory controller chipset to determine whether the ECC injection feature is available and fully specified.`