How does the Sorcerer archetype Eldritch Scrapper interact with Robe of Arcane Heritage?

Question

The Eldritch Scrapper replaces the 1st, 9th and 15th level bloodline powers.

If a level 8 Eldritch Scrapper puts on a Robe of Arcane Heritage, what will happen? So far, me and my friend have sussed out three potential candidates:

Option 1: The Eldritch Scrapper will advance the Martial Flexibility class feature, due to it replacing the bloodline power.

Option 2: The Eldritch Scrapper will gain hte 9th level bloodline power, but it will be removed again when she reaches 9th level, to be replaced with the Martial Flexibility ability.

Option 3: Nothing will happen, as the robe refers to Bloodline Powers specifically, and Martial Flexibility is not a bloodline power.

Answer 1

Option 3 appears to be the strict RAW ruling as I cannot find anything that would indicate otherwise and despite replacing bloodline powers Martial Flexibility is not a bloodline power. I would probably opt to go with option 1 since it does replace the bloodline power it seems fair to give you the replacement.