Why can't Python 3.3 be compiled for it? Even if python.org don't go and do it, it's entirely possible the build system changes required could be backported.
Also, why not just move to 3.9?
Also, why not just move to 3.9?
As to dumping 3.3 and solely relying on 3.8 (not 3.9), I don't think the developers think it worthwhile to dump an entire package ecosystem built in the last 10 years just for a native build.
A subprocess plugin architecture that used IPC to talk to the text editor would solve the problem, since the plugin host process could probably remain x86 and run under Rosetta.