This is why I mention things like "surprisingly current toolchain for academia" :-) My personal philosophy is staying current costs far less in the end that falling behind and then needing a giant transition...
https://github.com/MitchBradley/cforth
https://github.com/MitchBradley/openfirmware
https://github.com/MitchBradley/openfirmware/tree/master/cpu...