It's not especially well known due to Sturdee ruthlessly suppressing the information, but the only reason Sturdee was even at the Falklands in time to meet von Spee was that Captain Luce of the Glasgow met with him and pressed him to speed his leisurely coaling at Abrolhos Rocks on 26 Nov 14. Luce convinced Sturdee to sail 24 hours earlier than planned, and the Squadron was further delayed 12 hours enroute when a hawser being used to tow a target wrapped around one of Invincible's screws.
Captain Grant had of course prepared Canopus as a beached battery, and rigged a line of extempore controlled mines across the entrance. However, as our research has revealed, Canopus was a paper tiger. The German 8.2's outranged her, her 6" ammunition was essentially useless and her armour scheme was no better than Good Hope's ahd been. Unlike Good Hope, she was stripped of flammables (but then so was Brandt's Monmouth and she burned badly, although she did not become the bonfire Good Hope did).
So here's the question.
What if Luce not only failed to convince Sturdee at Abrolhos Rocks, but Sturdee continued his somewhat tardy ways?
This means that von Spee gets there for his raid (which is intended to burn to coal stocks so that an replacement Squadron sent to Port Stanley to block or chase him is stranded by lack of coal) there is only Canopus there.
So here is the suggested timing, adding a little more tardiness for Sturdee and a little more haste for von Spee).
0640 8 Dec 1914 - Canopus reporting system sights von Spee
0819 - Canopus opens fire
Question 1: What is von Spee's most likely course of action?
1240 - Sturdee's smoke seen by Dresden, which proceeds to investigate
1310 - Dresden identifies 2 heavy ships with tripod masts and reports to von Spee
(Invincible only capable of 21 knots, all ships low on coal, Cornwall has serious boiler defect, Bristol as a serious turbine defect)
Question 2: given your answer to Question 1, what are von Spee and Sturdee's most likely courses of action?