This sounds like the best way to do this. I believe @sjtrny is working through this in Is it possible to update just `layout`, not whole `figure` of Graph in callback? as well. The only thing to add would be to use dcc.Store instead of html.Div in case the “hidden div” feels too hacky. I don’t think there are any performance issues with using html.Div though.
The nice thing about updating a clientside store (html.Div or dcc.Store) is that other components can use this data as well like other charts or other data tables.
A flow that we imagined when writing this feature was: app.layout as a function which embeds a dataset in dcc.Store. dcc.Store then updates a data_table.DataTable directly (with a clientside callback) and then the DataTable updates a series of graphs with derived_virtual_data property. Then, the table is a natural UI for doing filtering & sorting of the data in the table and in the graphs without needing to write any extra Python code!