Anthony,
Cymetra and Alloderm are used for two different purposes and one CANNOT substitute the other. You have to remeber that there are two types of implants, suitable for two different types of ENS patients - those who need a complete fabrication of a turbinate and those who have much of their turbinates remaining (like yourself) and can do with a turbinate augmentation only. Let me explain:

1. The fabrication of a turbinate:
an implant which is implanted underneath the submucosa of the nasal mucosa (in the lateral wall, nasal floor or septum) - which is done in cases where the IT is too resected and cannot be rebuilt, or in cases of ENS-MT (when the MT was partially or totally resected). In this type of implant - an entire turbinate look alike has to be bulged into the nasal cavity. This requires a strong scaffold that will not spread around and will keep it's shape. It means - a huge piece of sub mucosa and the overlaying mucosa (as big as a small finger) has to be forced into the nasal cavity and has to keep it's shape. This can only be done by a substance that can form a firm scaffold underneath the submucosa. Such scaffold material that has been researched in the nose, includes - cartilage, bone, hydroxyapatite cement, micro-pore, silicone or Alloderm.
In this case - Cymetra will simply not hold as it is micronized alloderm particles in liquid form and cannot bulge out such a significant amount of sub-mucosa. Even if it could be directed to form a specific shape (which it can't, because it's not like cement), it would take hundreds of injections to push out the amount of sub-mucosa that a 2 by 2 centimeter of Alloderm sheet can achieve in a one time procedure.
By the way, the Alloderm in this type of implant - turbinate fabrication - is placed between the bone and submucosa in a special membrane layer that separates the two. It does not come in contact with the blood vessels of the submucosa. The bone is scratched a little to make it bleed and this causes blood vessels from the bone to grow into the matrix of the Alloderm. Therefore there is no way that the Alloderm interferes with the submucosal blood supply layer, so there isn't a question of "safety" here, or anything else of such.

People on this board who have had such an implant include Valerie and Chris. You (Anthony) did not. You had the second type of implant surgery:

2. The augmentation of an existing turbinate:
This is done in patients who have enough of an existing inferior turbinate that has enough bone and submucosa remaining (preferably above 40%-50%). In this case - Dr Houser cuts out thin spear shaped pieces of Alloderm and makes a sub-cutaneous incision into the submucosa itself, along the turbinate, in to where he places the Alloderm thin strips, and thus achieves augmentation or "fattening" of the existing turbinate. In this case the incorporation is into the submucosa itself. Still, I believe that even in this case Alloderm will be superior to Cymentra. First of all - Dr Houser found that it is very difficult to inject Cymetra into the submucosa, because a large amount tends to rupture it and spill out (ask Chris). Therefore - only tiny amounts can be injected each time with therefore a negligible ability to augment. Secondly, if you think of it - a strip of paper thin Alloderm will obstruct the blood supply much less the a splodge of Cymetra which will form a shape of a ball at the tip of the needle.
In this type of implant - Cymetra can be used for further augmentations at strategic points - like in the front of the turbinate - to further bulge it into the nasal valve region and increase the resistance.
Unlike Alloderm there is no established clinical study that can tell how much of the Cymetra gets absorbed. It is finally grounded Alloderm (each particle is smaller than 1 micron), therefore, unlike Alloderm, it has no supporting matrix.
This is the type of implant that you had and that Canada requires.

When comparing implant materials and possibilities - it's crucial that you remeber the fundamental difference between these two types of implantation procedures. Cymetra cannot do what Alloderm can, and is best saved for a more suitable function - fine tuning.