Pau, that's great news to hear your grafts did well.
If you want to try grafting the Red Himalayan, do it this month before it gets to hot, otherwise wait until next spring to try again. This time, let me know the size of your rootstock so I can try to match the diameter of the scionwood better.
I'm still grafting mulberries and the grafts are doing well. I usually graft from March - October for loquats, mulberry, longan, citrus, guava.