Hello Simon,
I am not sure if I get your question…do you mean changing the EA in the live account?
If so, it depends on the rules that you follow. What do you follow on the Demo account to decide if this is a good strategy fr your live account?
It makes sense to keep the same rules in the live account.
For example, if you are looking to trade on live only the EAs with Profit Factor > 1.3 than you would remove the EAs from the live that fall below 1.3 PF.