Yes, you manipulate HD-Reforged or even SD-Classics models using the powerful Retera M.S.
Download the most up-to-date version of RMS here:
Retera's Model Studio
Open the model in the program and in the "Scripts" tab you can, within the "Edit / Delete Model Components" option, do almost anything you can imagine, such as removing unwanted animations.
And then... In the "Animations" tab, uncheck the "confirmation boxes" of the animations that don't interest you, leaving only the ones you want to keep checked, and then just finish the process and wait a few moments until the animations disappear in your window "View".
View attachment 374814
In the main windows, passing through "View" and "Edit ", you find the last of the main windows, which makes reference to materials and animations. It is not yet very up to date, but it already contains some fields that work well, as in this case, to rename the animation according to your preference. There are several ways to rename, including editing the HD model in .MDL format, but.. In this window, you can rename faster and more conveniently.