|⦵⦵⦵ Fedor Checherov|
If you are using a Personal Boon for access to a race, your Personal Boon slot is generally not available for other Personal Boons, as you can normally slot only a single Boon of each type.
A few exceptions exist, and are explicit in how they work, such as the Tier 4 Faction reward for Wayfinders.
|⦵⦵⦵⦵ Arc Riley|
Yea but that one is specifically applied at character creation.
Its possible that the guild guide v2 will unlock the minor faction "Manifold Host" (distributed as a GM boon at certain 2017 conventions) for everyone, and the capstone boon for that faction is allowing you to slot a second non-race personal boon for an existing PC.