Howdy,

As these are both EPEL packages here is the proper way to request them: https://docs.fedoraproject.org/en-US/epel/epel-package-request/

Having said that, while EPEL 10 is quite populated already, there's still a lot of work underway branching and building everything from EPEL8/9 for 10 so odds are if you're patient it will be there soon :)

PS - I'm the EPEL maintainer of remmina and it's definitely coming to EPEL10.