You will have no problems on the bike especially if you are riding down the coast. Military checkpoints are much easier and quicker on a bike than in a vehicle I think. All the roads along the coast are in good condition and you don't need a dual purpose bike, your bike will do just fine. Bear in mind that if you return up Baja and elect to take the gravel from Mex1 North to Puertocitos and San Felipe, (very beautiful) the road is about 250kms long and very rough so leave early and do not be in a hurry. Also, if your bike has a short range be sure to buy fuel at Bahia Gonzaga. There is no Pemex there, But they do have good fuel in large drums for sale if you ask.
Garry said that you had called him earlier, but he had not heard from you prior to my leaving. I should be back in Mex. early January to pick up the bike again. Fancy a trip down South together for a few days?