It is possible.
However you need to use 2 accounts or copy reversed trades.
Option 2 accounts:
1 demo account & 1 live account, use trade copier with reverse option, so each trade executed on demo account will be copied as opposite on live account.
Option 1 account:
Use ea to trade micro lots eg. 0.01 and use another ea that is reading the trades from the same account and copy reversed trades with different lot size
eg. 0.1 lot. In that case there is a little influence on account from orginal EA, and high influence from reversed trades.
What you need to take under consideration is doubled spread that you will loose on any trade reversed like that.
Thus why the best option is to have access to the ea source code and just update trading conditions.