Betfred 100£ bonus on first bet, hedging?

[Gaahl]

I dont know if this has been posted here before, I searched, but I didnt find anything.

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Betfred is offering new online customers a bonus of up to £100, completely free with your first bet.

It really is as simple as it sounds!

Whatever you win from your first bet, Fred will give you an extra 100% on top, up to the value of £100. For example, if you win £100 with your first bet, we will double it up and give you another £100 completely free.

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Terms and conditions
This offer only applies to a customer's first online bet.

1. The bonus is paid only on the bet winnings and does not include the bet stake.
2. To receive the 100% bonus the bet must be a winner on an event with three or more outcomes and where the odds of the selection are evens or greater.
3. For doubles and upwards the cumulative odds must be evens or greater, and all legs must have three or more outcomes.
4. This offer only applies to win bets and on each way bets the offer only applies to the win part.
5. Only one bet is permitted per household.
6. The minimum stake to qualify for bonus is £10 (or currency equivalent).
7. The maximum payout is £100 (or currency equivalent).
8. Settlement of bonus will be credited to a customer's account within 48 hours of the market completion.
9. Betfred reserves the rights to suspend, change or terminate this Bonus offer at any time at it’s own discretion.
10. Betfred reserve the right to decline bonus payments on any wager at their own discretion.

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The first question I ask myself, isnt it possible to hedge this bet with a betting exchange site ensuring a profit?

I have verry little knowledge around betting exchange, but somethings tells me that if you f.eks play 100£ on homewin on a soccermatch with the odds near to 2.00 (decimals) and then sell around x£? near the same odds, on homewin on a betting exchange site (betonbet, mansion, ect) , you would ensure a win no matter what the result is?

It sounds good on the paper, but can anyone who has knowledge on exchange betting\sportsbetting put up a guide on how to maximize EV from this promotion?