This custom v3.10.10 branch makes the del keyword do nothing.

Compiling

$ ./configure --prefix=$(pwd)/result --with-pydebug --enable-shared
$ make -j8
$ make install

Experimenting

$ cd result/bin
$ ln -sf python3.10 python
$ LD_LIBRARY_PATH="$(pwd)/../lib/" ./python

>>> a = 10
>>> del a
>>> a
10