This sounds rather hypothetical, and the project has been very accepting of additions. The IOS project would love to have more contributors and adding to the project rather then forking and maintaining another version sounds like a more responsible route. You mention “my own users” now, is this a commercial offering ? Also Apple has rules around copy cat apps, if they find a app that is a rebranded version of another app, its a violation of their terms.
Any legal implication if i make reference to OpenHAB foundation in about page and the long list of Eclipse license write ip.
I’m not a legal expert and cannot give council, the EPL has been around for a long time so there is plenty of information on it. The EPL specially has a clause about derivative works, which is what this sounds like (mostly a copy), see EPL-2.0 FAQ | The Eclipse Foundation.