Timewalking trial characters farm

So to be fair I don't really know what the good bronze farms can yield per hour, but due to the scaling, low level characters absolutely demolish dungeons. Since you can play up to level 20 without a sub, if your sub is about to expire, you cancel it and then just make an army of level 20 characters.

You can do the daily heroic dungeon and scenario, this can take about 15-20 minutes and you will get a little over 2000 bronze. So if you do this on 4 characters you can get about 8000 per hour.

Now this bronze will be spread over different characters, but for buying the cheaper Items this doesn't really matter. It's also quite fun imo running through a dungeon deleting stuff.

Since this is completely free you can also try and get friends to do it with you which will make it even faster.

You will also keep collecting threads so your character will actually keep getting stronger.

Do you guys think this is a viable way to farm bronze? Or is it just way too slow?