Bookmaker opportunity

Hello,
A certain bookmaker is offering $300 non-withdrawable bonus to be turned over ten times on odds >2.99 before withdrawal. Problem is their odds are too low to value bet the bonus until turnover as since I started VB no bets have popped up for this bookmaker. Matched betting might not be an option either because I do not want to risk getting my actual funds tied in an account I have to turnover ten times. Are there any staking strategies that can enable one turnover such a bonus while loosing the least amount of it?