There is a setting in the Interface Settings called 'Show all items in selection lists' - if you enable this, you can create the master-template to get rid of every possible item, regardless if you researched it already or not.
also, this string should contain all vanilla-items that are reachable without cheatmode - all with min=max=0:
https://pastebin.com/jNpahSj7
just throw the raw past data into the import frame of LRM
[edit] just noticed: this removes planners and spider-remotes as well as the armors - even if worn.
If you don't want that, disable logistics, load the preset, edit what you need and save it again
[edit 2] this will leave 1 light, 1 heavy, unlimited power armors and all spider-remotes in the inventory:
https://pastebin.com/006fR8wb