I don't think that is desirable, necessary or affordable.
You need to look at two clear end products:
1) sufficient full-time maintainers to provide maintenance on all equipment in the inventory during peacetime; and
2) sufficient additional part-time maintainers who are liable be placed on active service to provide maintenance services during war time.
The numbers required for wartime are substantially higher than those needed for peacetime - probably four to five times as high.
You also need to take into account the life cycle of the average reservist.
1) During their younger years they are unemployed, inexperienced, seeking cash, single and available for full-time service.
2) As they grow older and gain experience they obtain civilian work, get married, have a family, are less available for military work during the week but have some availability for training on weekends and in the summer.
You can build a system that caters to both where you put people through their initial training (probably by way of a community college program on mechanics in general combined with additional military maintenance training on specific military equipment. That way the individual then gets both his civilian and military qualification and also becomes liable to pay the CAF back with some obligatory Class B or A service.
Follow that up with a year or two of full-time Class B so he gains experience and makes money and then keep him on for further obligatory Class A service in a part-time position in a maintenance unit.
The key here is that the full-time Class Bs maintain the equipment while the part-time Class As do not maintain equipment at all but instead train collectively on the field aspects of their job - in other words they get to practice more general military skills, gets some pay and are able to have a civilian job and family life.
But never, ever expect the Class As to actually maintain the equipment. That can't be done on a Class A part-time basis. They're you "break glass in case of fire folks."
You can't afford to have the full cohort of maintainers that you need for war on your full-time payroll during peacetime. Nor do you need that many. The bottom line is you need to build a system that caters to both needs.