Sorry for asking this here as it relates to a QF operated flight, but it would appear posters here are way more familiar with EC261 and my question pertains to EC261 in general, rather than the carriers specifically.

So I'm on the return leg of a ticket, flying LHR-SIN (QF) followed by SIN-HND (JL) 8.5 hours later. LHR-SIN is now delayed 11 hours so I will almost definitely miss SIN-HND. I planned to have a brief meeting in SIN (thus the long stop) so it's crucial that any rerouting includes SIN rather than going to HND directly on another carrier or via somewhere else (if it is even offered). Returning to HND is not important to me as it is not my actual final destination (although it would be on this ticket). I have another flight on a separate ticket onward from HND to my final destination.

My questions are:
1. If I am offered rerouting to HND on a different carrier which gets me there before the original scheduled arrival time (easy to do if SIN is bypassed especially given the long stop I have there), and I decline it, because I want the original routing via SIN, am I still entitled to EC261 compensation?
2. If I stay on the QF LHR-SIN flight delayed 11 hours, JL will need to rebook me for the original SIN-HND sector. If I can convince them to change the routing direct to my final destination and they agree (thus changing it from HND), am I still entitled to EC261 compensation?