I have just added some modifications for pipewire-jack. Starting with jack >= 0.126.0, jack2 1.9.20 and pipewire-jack >= 1:0.3.43-2, pipewire-jack and jack2 (or jack for that matter) can not be installed side-by-side anymore.
Over the past months I have spent some time to consolidate the legacy example-clients  and tools  and the variants from the jack2  repository into a new project: jack-example-tools . The tooling that historically came with jack can now be installed separately and remain installed when switching jack implementations.
However, do note that there are still significant differences between jack, jack2 and pipewire-jack (which is also reflected in how or if all tooling works as expected) and that workflows around "how to start jack" differ greatly depending on the tooling (for more info you might want to refer to the respective upstream documentation).