It's impressive how no body can understand the use of Negative account protection as a kind of Guaranteed SL.
Yes you can do it, even at 400:1 and all in, ah suppose you run the account danger close to the margin level, but still say you have $2000 in it, it's going to take a hell of a move to burn through $2000 and get to any profit.
So 98% of the weekends you'll be +$1000 on 1 account, -$1000 on the other, balance account over the week, repeat.
When you do get some profit is move bigger than 2K then it likely won't be that much, depending on the move, then you'll have to open a new account somewhere else, there not going to let you get away with it more than twice for sure.
So unless you've got a Million to make it worth while first strike then I wouldn't bother

sorry!!