Let's say your weekly DCA is $50 and you know that withdrawal fee will be needed you can make it $55 and use the $5 to cover the fee.
I don't think it is a smart move to use 10% of your capital as withdrawal fee, that is too high for me. Instead of doing that, you could buy weekly but withdraw monthly, this way you will be cutting down the fee to 2.5% of your capital. If you continue to spend $5 as withdrawal fee for a $50 weekly DCA, that will amount to $260 annually as fee which is too high for such a low capital. So lile I said before, instead of this, a weeklg DCA and monthly withdrawal will be better.
What I'm suggesting to you is also what I'm doing because we have to maximise the opportunities while cutting down the cost of doing that.