Hi
@TheScrutiniser - I am in exactly the same position! Just wondering if you got any more information/guidance on this? (though purely theoretical for me, as I don't have an IEC ITA)
It's a bit of a grey area, admittedly. I spoke with an immigration lawyer and although it's not advised to use the IEC as a bridging visa while waiting for PR, they are exclusive of each other, so you can legally do the IEC (if you get your ITA) and then flagpole. Normally, given we are both FSW-O candidates, you would have to leave Canada (not flagpole) to make this a reality, but for now there is a policy in place (due to COVID) that means it's legally permissible to flagpole and activate the PR from IEC.
The issue lies within the nature of the respective programs. IEC is a working holiday and thus the rules are as such; you are expected to show a willingness to return to your home country upon completion of the program. However, given our positions, we would be looking to use the IEC strategically, while waiting for the beloved PR, despite no guarantee that we will receive it. So it gets tricky with landing in Canada to activate an IEC, because a border agent will note that you are also a PR applicant, and you can't say 'I'm here to wait for my PR' as that demonstrates plan to stay long-term, which isn't what the program is for. Yet if you lie and say you will return to your home country, then this is misrepresentation, as that's not why you are there.
All in all, it's possible and it isn't illegal to do so. The issues lie in the difference of conditions of each visa program, the questioning of the border agents upon landing for IEC and also the fact nobody can say for sure how long this policy will be in place, so you might find yourself in a situation where you've moved across on an IEC successfully but they remove the ability for IEC's to do a bridging visa and flagpole, as in normal times that hasn't been allowed.
I hope I've helped and not confused you, haha. We are pretty much in exactly the same situ when it comes to timeline, so I hope we get some good news re. PR soon.