Hi Richd,
No I haven't found a baptism for Daniel Wheeler.
I've looked in these transcripts (all ex OFHS);
E.Hagbourne, North & South Moreton, Blewbury,, Upton, Didcot, Aston Tirrold (Daniel Henry Wheeler - bapt. & Bur. 1862 & Shadrack Bur 1881), Long Wittenham, Sutton Courtenay, Appleford & Wantage - because West Hagnourne was part of that parish until it had its own church.
All these are either neighbouring or parishes close by Hagbourne
The IGI (FamilySearch) has several Daniel Wheeler baptisms in Berks - Reading 1793, Pangbourne 1797, Thatcham 1800 and Wokingham 1803 all are possibles, although I think Pangbourne is the most likely but still a few parishes away from Hagbourne. There are also two in Buckingham which are "submitted entries"
Not very helpful I'm sorry to say.
Alan