Reply to my own question,

Some success, What a relief because the more I use the system, how easy it is for the harmony to loose what input & actually other issue that almost made it unusable.

Anyway, I added the device DVD/Min System DAV-HDX500

Tried many since but very luckily the first I tried (else I might have given up) worked with two input.

Input DVD
& Input TV

Would be nice to have more but actually this is fantastic because with two genuine starting points it can minimize cycling & prevent (Or recover) correct input.

Yet to set it up fully but thought I would post as many seem to be reading this post, so either they may same situation but also is hope someone knows these DAV units & might suggest something that might have other inputs to work.
Although the HDX500 above have numerous inputs listed but only those 2 did anything so suspect just these two will ever actually all I really need to get by quite well.