Hi Harry. I had a similar accident that forced me to divide my precious G. armstrongii. I put several severed leaves in small pots of turface. It took upwards of 8 months to a year, with very occasional spritzing (i.e. so occasional I can't remember how often). Even the most damaged cluster with only two young leaves and mangled roots survived, it just took a very long time.
Hope this helps.
Pagan

Thanks guys,
I shall make a try

here two pics

greets from Harry

Harry, at least the meristem is intact, so with time, you'll have a great plant! Not sure if those pieces will root as there is no germinal base. As you know an Echeveria will usually grow a new plant from an intact leave but one that is split will wither and die. I would think this is true for Gasteria, also.

Harry, I saved this thread about gasteria propagation from leaves:
-gasteria propagation-

Rina

Hi Rina, very clear.
I'm going to try!!
greets
Harry