Hello, Georgina.
The only James Howard b circa 1795 Enfield shown in the IGI is one bapt 1810 so probably too late for you. His parents were a John & Ann & there were 8 siblings. I can send you details if you would like to have them.
With regard researching for baptisms in the Enfield area I can only tell you of my own experience of doing the same thing. I knew that my 3 X grgrandparents were married at the large Enfield church of St Andrew, in 1818, I had a copy of the PR entry. After marriage they moved into London & were at the same address for 5 census years, the place of birth given for 3X grgrandfather was varied, ranged from Tottenham, Southgate, Edmonton & Enfield. However much I searched I could find no bapt for him. I must admit this was at the early days of my research many years ago, so was really feeling my way around the PRs available. The penny dropped one day when I realised that I had a clue from my own birth cert. Altho' I was born in Tottenham the registration district was Edmonton, just goes to show it does help to read all the info on a cert. !!! I then realised just how huge this district was, covering the sub-districts being Cheshunt, Enfield, Hornsey, Tottenham, & Waltham Abbey, which covered most of the places of birth for ggggrpa, I then found that there was one large church in that area that had not been fully transcibed for the IGI. All Saints, Edmonton, altho. technically in Edmonton it is only a short distance from St Andrews, Enfield. The PS for All Saints on the IGI start at 1831 & is associated with Southgate which start at 1805. It is also associated with Weld Chapel, Southgate.
The PRs for All Saints are at the London Metropolitan Archives so that meant a visit for me. Within 20 minutes of looking at the film for PRs prior to 1800 I had found the bapts,marriages & burials of most of my 3 X grgrandparents families.
I hope you have found this a help in your search for the bapt of James Howard, altho'it might mean a personal visit to the LMA.
Meliora