I've not heard of slow release insulin
Herein lies the problem. Medical advances are running ahead of the regs (and taking insulin for type 2 is quite common, especially amongst older sufferers). Slow release insulin (such as Levemir) has "no chance"* of causing hypoglycemic loss of consciousness, but as a non-oral medication, is disqualifying.
For the record; not all type 2 sufferers are obese, lazy gits with poor diets. Often, type 2 diabetes
can be controlled with changes to diet and exercise- but not
always.
*as stated by the relevant endocrinologist.