The following are quite helpful but maybe not informative when regarding hardening of windows. They do however confirm both the dual boot scenario plus Silverblue specifically. I seemed to have missed that the first look through 
Dual boot and security - Privacy - Privacy Guides Community
Dual boot with Windows / Silverblue and encryption? - Privacy / Questions - Privacy Guides Community
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Dual boot with Windows / Silverblue and encryption? | 9 | 449 | August 25, 2024 | |
| Dual boot and security | 7 | 1340 | December 11, 2023 | |
| Which OS for private secure internet browsing PC? | 62 | 1828 | October 21, 2024 | |
| The risk of windows? | 15 | 760 | May 6, 2025 | |
| Inclusion of a basic guide/ recommendation column for hardening Windows | 14 | 2230 | February 6, 2024 |
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