Custom image on Wyse thin client?

So we have some older C50LE Wyse thin clients with a trimmed down SUSE Linux image on them. The rdesktop client has been having reliability issues since we upgraded their windows domain to 2012, but there is no newer update available from Dell for these.

My options are to try and migrate and configure FreeRDP or the like onto it without a package manager, or just wipe the thing and go with a different distro.

Is this anyone else has tried out or done? Hoping to avoid spending a lot more time on trial and error. These things don't seem to have a package manager at all.