Honestly, while I see your point that your assumable rate is lower than the market and could be viewed as a feature for your property, I don't know how that would translate into being able to ask for a premium in your asking price.
The reason that I say this is because, as pointed out elsewhere, the buyer would have to be able to come up with the difference between what they offer and what the balance of the loan is and that's going to rule a fair number of people out. To these people, who will probably be the majority of your potential home buyers, your home may simply appear over-priced.
Another consideration for you is that while the VA mortgage is assumable by non-veterans, a portion of your VA eligibility would remain attached to the property and this could affect your ability to use your entitlement again if you so desired.
Now all that said, I'm a bit different in my philosophy on pricing a home in that I'm a firm believer that it's far easier to go down in price than it is to go up. That being the case, if it were my home, I'd test the market for a couple of weeks and see if there is anyone out there who would see the benefit of giving you a premium for your attractive mortgage.
If you're overpriced, all things considered, the market won't hesitate in telling you this by either having few showings or in having a bunch of showings, but no offers.
I hoped that this helped. If you have any further questions, please don't hesitate to reach out to me through my profile here.