I have to agree with Marc on this. There are plenty of test and RFC1918 addresses for private nets or nets behind NAT where it makes no sense to use 44.128/16 as a test or private space. Where normal firewall rules might catch a leak of an RFC1918 address, they wouldn't catch a leak of a 44.128/16 address.
If you need a 44-net block, just coordinate a subnet for it. Net 44 is sparsely populated and it probably always will be and while there might not be a pressing need to allocate 44.128/16 to "real" addresses I see no reason to reserve it for all time. Deprecate it now with the advisory to contact your coordinator for an assigned address space.
The entire 44/8 space is "experimental" by definition.