They are just over 1 year old. I keep them together with flock in coop. I only keep chickens as pets, being a city slicker where I live. No roos allowed in my area.
My current total is 8 hens. 1 RIR LF. 2 Polish LF. 2 OEGH banties, 1 Japaneese Bantam, and the 2 Seramas.
I have had Sebrights in the past. They were somewhat larger bantams than my OEGH, or the rest of banties I have now. I did like that breed, and my Silver Sebright lived for 13 years. My longest living chicken.
I could have gotten silkied seramas, but I preferred regular feathers. I live in cold winter climate, so preferred feathers over fur

on my chickens.
here is a pix of all my current flock.
View attachment 2217865
and here are my almost daily dinner guests/visitors. Mallards. They live along a creek about 2 blocks away. Eating whatever the bird-feeder drops. The white one is a PLASTIC one
View attachment 2217868
So sorry to hear this, but you were aware that the end would arrive.

I suggest you return kitty back to Earth. Location you mention sounds ideal. You will always have comforting memories that you provided the best for the journey to that rainbow bridge.
I also bury all my pets in the back yard. I do cover the spot with cement patio blocks to prevent other diggers from removing. After a while, I am able to remove blocks, and no digging occurs.
Planting a tree is a very nice option.