Hello!
They fork out a wad of notes for your recurrent and you leave the following week?
This is one of the risks of employing people. And an employer can not delegate all his risks to his employees, can he? Otherwise he would have to share all his gains and profits with the employees as well for sake of fairness...
The best way for an employer to protect his training investment is to treat his people well. Then they will stay with him.
I would not sign this contract. Under no circumstances. You are better off as a freelance pilot than as an employee with those conditions!
Regards, Max
NB: Before I turned to flying, I worked as aerospace engineer. My various employers sent me to a lot of different training courses (mostly IT related). Never was I asked to share the cost of these courses or to sign a bond of any kind (would have been illegal in my part of the world anyway, as someone already pointed out).