How to set the execution order of G-codes and o-word or remaps

ok M0 is a queue buster - you need to wait until control returns.

In python remaps one uses yield
linuxcnc.org/docs/devel/html/remap/remap...ntions_ngc_to_python

'Dealing with queue-buster: Probe, Tool change and waiting for a HAL pin'

It's not clear to me if this is possible without using python directly

I have experienced this behaviour before with user defined M commands. When Mnnn is followed by 'M66 E0 L0', it works as expected.