It's done... Just needed to fly ComfortFlex and Flex fare (S, L fare)

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Hello World, I miss the good old days of travel, and it is MR time! In short, I need 9000 miles (including 4x A3 segments) to keep my *G and I doubt there will be another extension (I wish!)

It has been a while since I did my last travel plan, and my brain is getting rusty...

My plan is to fly out of YYZ to somewhere in Europe (AC to LHR seems to be the cheapest option at the moment, and that's a roughly 3500 miles return trip)
Then multiple A3 segments from LHR to ... I have been looking and looking and the mileage for Light fare will not cut it. I will have to fly Flex or even ComfortFlex for the extra miles (need about 5500 miles!!). I am looking for some creative minds here for a back to back A3 segments ideas, like LHR-A3-ATH-A3-XXX, where XXX is not in Greece. (or even LHR-SK-XXX-A3-ATH-A3-YYY, which I have done in the past.)

Initially, I was thinking of LHR-ATH-IST and taking TK to somewhere in Asia. But TK website is kinda troublesome and most of the fare doesn't earn miles. Although, in the past, I have done ATH-TK-IST-TK-HAN, which is pretty nice.

BTW, I have tested the A3 'low fare calculator', it is a hit and miss. For a few times at the booking stage, I have found an even cheaper day to fly listed at the top...