OP here.
Thanks for the discussion guys.
The reason I bring this up is because D&D 5e is VERY STRICT with it's ready rules.
For example, a rule in 5e reads something along the lines of "You can't trigger a readied action to an abstract concept." Read: Meta concept.
Pathfinder 2e made me double take when the restriction on Ready was pretty much just "Choose a trigger." Sweet, there's plenty of triggers in the book I can use without argument. In fact, the completely relaxed nature of P2e's Ready made me think this was a deliberate choice.
Many of the arguments above consist of the "Specific overrides General" approach. Which is fair, but I can't help but notice that these arguments never actually quote the General Rule.
Until Ready gets some errata, there is no issue with the trigger I am choosing, and no issue with triggering it identically to the feat I am stealing it from, as long as I meet the requirements for the trigger. Any arguments to this will also break the feat. If you disagree, please provide the RAW (and associated RAI if applicable).
The issue comes down to what happens to the attack I am moving away from.
The two closest rules I can find (which are also above):
Core Rulebook pg. 304 wrote:
If you choose a target that isn’t valid, such as if you thought a vampire was a living creature and targeted it with a spell that can target only living creatures, your spell fails to target that creature. If a creature starts out as a valid target but ceases to be one during a spell’s duration, the spell typically ends, but the GM might decide otherwise in certain situations.
Which is nice, but spell related. Either way... up to the GM. We can do better though.
Core Rulebook pg. 472 wrote:
You have to spend all the actions of an activity at once to gain its effects. In an encounter, this means you must complete it during your turn. If an activity gets interrupted or disrupted in an encounter (page 462), you lose all the actions you committed to it.
Nice! Means this is all acceptable by the rules, right? Not quite...
Core Rulebook pg. 462 wrote:
Various abilities and conditions, such as an Attack of Opportunity, can disrupt an action.
Specific things interrupt or disrupt, you can't just get a free interrupt or disrupt because whoops I'm not in range anymore.
[Edit]
You could also argue that an attack is an action, not an activity, and therefore not applicable to the above interruption or disruption effects
[/edit]
So then what happens? It's up to the GM because the deliberate ambiguity of the Ready rules. (I feel like I have to add that I say that with zero animosity - I love P2e!)
Sad face emoji. I'm not going to force my DM to deal with the mess above. I honestly thought this was how you emulated 5e's Dodge or other RPG's defensive maneuvers. Shields or bust I guess?
[edit]
Also, yes, the whole point was to make the enemy waste the first attack, step, and then attack again with -5 if he even had an action remaining. Holistically, it was more about openly saying "If you want to attack me, I'm going to seriously mess with your action economy, so just run off and play with the tank will you?"
[/edit]