In the nineties, when I was at Veterans Affairs Canada, that was more or less the practice. Veterans were granted disability pensions according to the extent of their impairment expressed as a percentage. The department also determined the extent to which the impairment was attributable to military service. The department could determine, for instance, that the veteran had a 50% impairment, but that 20% of the impairment was attributable to military service.
I've been away from Veterans Affairs Canada for 20 years now. A system like that would provide veterans with an immediate pension, and thereby give them access to treatments and services such as the veterans independence program, which the minister mentioned in his statement. Veterans could access those services from the outset. In civil law, there is such a thing as commencement of proof in writing, so yes, it would be possible.