Has anything ever come out of the ideas for a new HP 39gII firmware?

[MJGraf]

Some 6 or 7 years ago, there were several threads on this forum discussing a possible new firmware for the HP 39gII, like

https://www.hpmuseum.org/cgi-sys/cgiwrap...ead=232259

https://www.hpmuseum.org/cgi-sys/cgiwrap...ead=227741

Has anything ever come out of these discussions? Is there anything to build on, like a toolchain, or a Hello World?

(The reason why I'm asking is that surplus 39gII are now being sold on AliExpress for less then EUR 20. I couldn't resist, and I'm impressed by the hardware, and underwhelmed by the software...)