Maybe, but as an ex electronics tech I’m not in favour of massively exceeding a component’s rated capacity.
I came up with Tofty- custom made a while back (no longer made) and they appear to be too big? Tofty's 10A Tailcap Switch (17 available)
That lead onto Judco switches which can be easily modded and may possibly be made to fit (rated at 10 Amp.) They’re also readily available off Digikey. Modding a Judco Switch Something to maybe look into.
I’ve done some more investigating into the stock S2+ switch and it appears to be much the same as the higher current one available in the Convoy store https://www.aliexpress.com/item/1005002568040603.html . The switch looks the same, the spring wire is 1.0mm and non magnetic (noting they also sell one with an iron spring https://www.aliexpress.com/i/32651199547.html )
I did find some daggy rough edges on the switch’s circuit board so filed them off and clean everything with some decent contact cleaner/ lubricant - including a drip into the switch itself.
I was getting 5 Amps (limit of digital power supply) powering the head/ pill assembly off a power supply at 4.1V. I retested and that was stable down to 3.55 V , at 3.50V I started getting some current drop off.
I reassembled the body onto the head and used a Murata VTC6 cell with a wire loop and clamp meter and got 5.45A with the tail cap removed. (The wire wasn’t central in the clamp meter like you’re ideally supposed to have it for these readings.)
I then tried to measure with the head detached and the clamp meter wire bridging the body (with battery/ tail cap fitted) to head/ pill - that was hard to do and was in the 4.x Amp range. But I couldn’t get a good reliable connection… as I was trying to maintain the pill spring to battery positive connection and didn’t want to short out the battery!
It does seem to be performing a bit better- perhaps cleaning up the tail cap, PCB dags, lubricating the switch and the various connection points helped a bit?
PS: Why does the forum convert Aliexpress links to German! 