Some feedback based on what I have tried over the weekend - for those also struggling with hiker’s rash.
I wore long tights, so my legs were covered. I rolled my hiking socks over my hiking boots. I applied Mitchum anti-antiperspirant from my ankles up to slightly higher than where my boot would end. A good 40 minutes later I applied Advantan Fatty Ointment (as prescribed by a Dermatologist). And ta-da, hiking on both days and not a single mark! It is definitely not just the Advantan that worked, as I have been using that for months already and I still get the rash, however, the swelling is better on day two, compared to not using it, but it still take days, if not longer, for the rash marks to disappear completely.
Seems like the above combination is a winner! As mentioned, both days of hiking and not a single mark in sight!