Yes, Brimpton to Lambourn is about 20 miles, a bit less for Brimpton to East Ilsley.
There certainly was a Francis Deacon in Ilsley, as there is the 1637 baptism. I should add there's also a burial of a Francis Deacon in 1656, so if that's him he didn't make old bones. But the records are very patchy as said, so there may have been an older Francis whose baptism was unrecorded, or elsewhere.
For completeness, much earlier a Richard DEKYN married Sara NEWBERY 17 Apr 1589 in West Ilsley, and baptised a son Richard on 2 Nov the same year. There don't seem to be any more entries for them so they could have moved to East Ilsley.
Then we have the confusing Richard Deacons in East Ilsley. There may be two or three of them, or they might even all be the same one!
The Richard who married Elizabeth Hopkins and sired Francis 1637
The Richard(s) named as father at the following baptisms with no mother's name given:
1653 Mary, 1655/6 Elizabeth, 1657/8 Anne, 1660/1 John*, 1663 Richard.
The Richard who baptised the following with wife Christian:
1666 Thomas, 1669 Martha
One burial of a Richard Deacon, in 1676.
*John married a Joan and had three daughters.