There is no easy answer. A lot depends on you, your skills, needs, wants, motivators, expectations etc...
Most jobs need some kind of experience unless you are looking at entry level for which you often need to start at the bottom with a commensurate salary. Could you forgo a comparative wage to what you earn now to get to where you want to be or afford to take further training if needed off the job?
Yes high qualifications can be a door closer, the best way is to get in and prove yourself (ability as well as staying power) and start at the bottom if you have to, volunteer, temp, train... It's a big risk though, the grass may be greener, it might not.
Think of the job market from an employer's point of view rather than your own - if choosing between a number of applicants then do you go for the one who might have all kinds of qualifications (which aren't needed) and comes from a relatively secure and well paid profession they trained long and hard for saying they want a fresh start but may find out they made a mistake and want to go back or do something more related to their qualifications or on more money and they have invested time and money for nothing and at the end of the day business is time and money.
It would be a calculated risk, the key is getting the calculation weighted in your favour and that can take sacrifice to make yourself a worthy investment.
If you are into countryside/wildlife preservation then there are plenty of opportnities for volunteering and, being a teacher, could you capitalise on the school holidays to get involved, meet people, research your options.
I would never recommend hiding important details. Once an element of dishonesty is revealed it, at the least, leads people to wonder what else you might have hidden, failed to disclose or otherwise been less than truthful about and is damaging to the trust of your employer.