i think normally dkv doesn't reimburse the hospital deposit, that's according to their agent. in practice, i was able to get my deposit refunded. so i'm not sure what their policy would be if you paid the deposit before the 8 months time period kicked in. my guess is they would just look at the claim date and reject it, but you can always try...
fyi- dkv's guarantee letter only covers up to 10,000euros so if your delivery bill is higher, you need them to reissue the letter to the hospital. i had to have this done just before x-mas and it was a huge pain in the a** while in the hospital recovering from the delivery and trying to chase the agent and insurance company to reissue before i checked out. (i had an emergency c-section so my matilda bill was over 200,000hkd.)