Let's say I am on a paid F ticket and want to SDC. If only Y is available can I take it, and if I do, will I still get the double EQM's permitted by the fare class?

I assume the EQD's would not change since I'm paying the same amount.

I'm on a tight "budget" to make Plat Pro but I have a very ill relative and if they pass away I might have to scramble. If I have to change my day of travel I will probably get an award ticket home and then use the residual value of the return ticket to hopefully book a MR. On the route I fly, F is around $600-650 oneway and Y roundtrip is around $450 so I should be able to come close - although I won't really be thinking of a change fee or the like, I'll be thinking of family.