Synephrine can act as a stimulant in some people, so be careful if you chose that.
That being said almost all of evomuse's fat burners are a nice non-stim option.
If you wanted to replace the caffeine in your EC stack, you could do it via one cap of oxymax xt per Eph dosage. you will still get the benefits of EC but the added benefits from oxymax xt (lbm retention thanks to 50mg f95, mood elevation and appetite suppression from the other ingredients, and a good dose of amento to keep strength up). You could also alternatively use other stimmed fat burners, but check to see if it's more than just stims in a cap