braluca, all related to the multistream in my image has created by CrazyCat. I did not take very much attention to it.
I do not have 5W, so I do not know if everything what you want from multistream on 5W work in my image.
If someone confirms it, OK.
But in any case, I recommend buy mipsel receiver and for multistream use a separate USB tuner.
On openpli athoik has taken a lot of work to implement multistream in standard openpli image. He using many changes from my git.
As far as I understand now also in standard openpli multistream should work if it is supported by tuner.
Search in the openpli forum, there should be a topic about this.

I do not know or exactly your card is working in my image, but if it do not need anything special and it is working on other receivers using sofware cams (for example oscam), then it should work also in my image.
In Amiko Alien 8900 you can insert only the card, not cam module!

I myself have Amiko Alien 8900 but as I wrote, I would suggest a better buy mipsel receiver.
It has better support and a large amount of different images.

Many thanks for help patience and suggestion.
Italian forum confirm 5W multistream ok with your image.
You gave me many point to investigate, I start to dig.
Octagon SF4008 is a temptation