The phrase "even though you will" is correct and usable in written English.
It can be used to introduce a contrast or concession regarding a future action or situation.
Example: "Even though you will face challenges, I believe you can succeed."
Alternatives: "despite the fact that you will" or "although you will".
Even though you will win less than half the time if you choose higher, when you do win you will win more money.
"If not, you have to be convinced that exercise does something good for you, even though you will be the last one to finish each race".
"It tells them that, even though you will probably still win elections, you're not going to do it by wrapping yourself in the Conservative banner," he said.
Even though you will never ever use it, you should have a history of, well, what he ate for breakfast and what he did the night before, in order to be able to write about him eating lunch.
And even though you will (inevitably) think that everyone who gazes at you is onto your little secret, they will not be, because they probably never registered your perceived flaws in the first place.
In your case, the contract for your speech is with a US company so it will be treated as supplied in the US and subject to VAT in the US, not in the UK, even though you will be speaking in Britain.
Then I'll show you that, even though it will be difficult and risky, if you are determined it may not be impossible.
"Guess who was there last night, even though you'll never guess.
St Osyth is earthier than this, even though you'll find Rollers parked next to the fanciest caravans.
Once you've completed your run – even though you'll be knackered – don't forget to thank those who have supported you.
All of this just sounds like the cable system we have now, but cutting out the middleman of Comcast, Time Warner, or Verizon (even though you'll still be paying for them to provide broadband).
