This is definitely the place to start, but Drafts is incredibly unique on iOS in that you can pretty much customize keyboard shortcuts entirely, by way of custom shortcuts per Action.
The best way to illustrate this might be to simply share my current list of keyboard shortcuts, which I’ve also published in a GitHub Gist.
Embed <audio> Element: ⌥A- Strikethrough: ⌥S
- The Psalms Custom Preview: ⌘P
- TAD-Trash Note: ⌃-
- TAD-Toggle Last Two Modified Drafts: ⌃⇥
- TAD-Load Previous Workspace: ⌥⌘←
- TAD-Load Next Workspace: ⌥⌘→
- TAD-Link for Draft (Title): ⇧⌘K
- Find: ⇧⌥F
- Tasks: ⌃T
- Indent: ⌘]
- Outdent: ⌘[
- Toggle Theme: ⌥/
- Markdown Header (#): ⌃⌘H
- Markdown Bold (**): ⌘B
- Code Block (```): ⌃⌘C
- Preview: ⌥⌘P
- Markdown Emphasis (_): ⌘I
- Markdown List: ⇧⌘L
- Markdown Link: ⌘K
- Replace URLs by MD links: ⇧⌘U
- Markdown Footnote: ⌃F
- TAD-Selection Word Count: ⌥⌘W
- TAD-Show Draft Info: ⌥I
- TAD-Toggle App Theme: ⌥\
- TAD-Toggle Typewriter Mode: ⌥T
- TAD-Search Actions: ⌘/
- TAD-Fetch URL Content to New Draft: ⇧⌘D
- TAD-Copy Draft Link: ⇧⌃C
- TAD-File Import With Tags: ⌘O
- Copy: ⌥C
- Email to myself: ⇧⌥M
- Save to Files as…: ⌘S
- Send to Bear: ⇧⌘B
- Save to OneNote: ⇧⌥O
- Clipboard…: ⌥C
- TAD-Move Checked to End: ⇧⌃↓
- Switch to The Psalms’ Workplace Shortcut: ⌘2
- Switch to Documentation Workplace: ⌘3
- Workspace Shortcut ⌘4: ⌘4
- Open Keys Workspace: ⌘5
The majority of these are Actions I downloaded via the Action Directory and manually set/altered their respective keyboard shortcut as per this documentation.
@Felciano I would be more than happy to speak directly about this if you need further help - my big life project right now literally involves documenting Bluetooth keyboard support on iPhone, so it’s pretty darn fresh in my mind.