A little update of what I did finally! I took the decision to be authentic, so I told her I would give her small gifts that she asked for, but that wouldn't be the gifts I would have give her usually as I was feeling too much pain. She said she was ok with that and wanted me to give her a gift when I will be ok with that.
I did however gave her another "gift". To remember her I was already giving a gift by staying, I told her I would try to grow a beard as this is something she asked me before. She seemed really happy!
Aspenstrong, I don't think it will take him away from his amends making, as long as you told him why you are doing this and how you are feeling with this. This thread showed me that there was no good or wrong answers, as long as you stay true to yourself, authentic and communicate with your WS.