Calibration / Tuning Tool Support

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The canonical answer to this would likely be: rqt_reconfigure (which also exists for ROS 2):

Whether that would fit your requirements only you can decide of course.

Your post confuses me somewhat though:

I've some years of experience in running ROS1 applications and tuning a limited number of scalar and vector parameters by means of rosparam.

did you have to restart the node(s) for which you changed those parameters? Nodes re-reading their ROS parameters at runtime is a known anti-pattern, but that would be the only way to "tune" parameters while things are running.

dynamic_reconfigure would be the infrastructure to use for runtime updating of parameters, but if you were already using that, I'd expect rqt_reconfigure to be a known tool.