You don't say what your full time job is and what your education is.
Most of the options you list are part time endeavors.
Your #4, Safety Inspector, would be a full time position with an engineering related company or a lift manufacturer. The state usually requires a certification for such positions a well. So, unless your looking to change occupations maybe one of your other options would be the best solution.
Your #5, pins etc., is alive and well at Vail properties with their Epic Mix. But, Vail doesn't have anything in Montana.
Your #3, gear testing, is best accomplished by talking to your local area mountain operations or local ski shops. The major magazines typically do their gear tests at one resort for one week in late season so there is not a lot to do the rest of the season, unless your thinking of testing for a single manufacturer. In that case send resumes to every north american office of equipment companies.
That leaves your options #1 and #2.
These two positions, Instructor and Patrol, are best for unmarried people not supporting a family if your thinking of full time. Both can be done part time although depending on your home area the patroller positions may be the more difficult to break into part time. The patroller gig has a long learning curve and you won't be responding to injury situations your first year. You'll be moving ropes and signs and other 'maintenance' activities as well as cleaning the patrol shack; making the ski area safe for the public. But long term, in Montana, you might get to play with explosives if you stay with it, real fun. Also, if you want a sense of doing something useful, nothing could be better than helping another skier who is really in trouble.
Your #1 option, instructor, can be done part time. The initial training is not that difficult and you will be dealing with beginners your first year. You will need to set aside at least one day a week for instructor clinics; this is where your real instructor training will take place. After your first year you can start working on PSIA certification. The sense of accomplishment is tremendous with instructing. Working with kids is great but working with a 30 year that is a never ever is fun and challenging. You won't believe how afraid an adult can be about riding a magic carpet.
Should you get the opportunity to work with people with disabilities you will really have that feeling of doing something useful. You will be totally exhausted by the end of the lesson but seeing the smile on the face of a 14 year old autistic boy when he is finally able to slide 100 feet by himself will tell you you just did something useful.