If you want to run CE code from CE repos, run CE, and then you post "it doesn't work" messages in the CE forum where someone that cares about CE code issues might reply to your message.
I installed OpenVFD from CE repo because it isn't available on LibreELEC...
I didn't know if LibreELEC no longer supports OpenVFD or it was missing from the repo because of something else. By your extremely clear and helpful reply I guess it's no longer supported. Thanks!