2.3.1792 Stevens at Brand Hollis' / 24.12.1792 Stephens there / 2.6.1797 again / week ending 22.11.1794 Stephens at Tooke's trial / 31.1.1797 Stephens at Joseph Johnson's / 21.2.1797 again / 14.3.1797 again / 18.4.1797 again / 9.5.1797 again / 27.6.1797 again / 11.7.1797 again / 22.8.1797 again / 24.10.1797 again / 7.11,1797 again / 6.2.1798 again / 27.2.1798 again / 8.12.1798 again / 11.6.1799 again / 15.10.1799 again / 4.5.1803 again / 16.3.1804 A Stephens adv (at theatre) / 5.3.1805 Stephens adv at Philips' / 6.3.1805 again / 28.11.1805 Stevens adv at Philips / 22.5.1807 call on Stephens / 23.5.1807 call on Stephens & w. him on Crutchley & Fry / 18.8.1807 Stephens at Johnson's / 23.6.1817 Stephens at Curran's / 15.4.1825 Stephens (Library) calls / 15.3.1830 Stephens at Kenney's
The spelling of the first entry was probably Godwin's error as there are two more entries at Brand Hollis' both spelt Stephens, and Stevens doesn't re-occur in Godwin's diary till 1805
Alexander Stephens DNB 1757-1821 whose memoirs of John Horne Tooke were published 1813, subscribed to expenses of trials of Hardy & co. 27.3.1795, will PCC 1821 Chelsea. The only time Godwin used an initial for Stephens or Stevens in his diary was on 16.3.1804 adv A Stephens (at theatre?). This was 10 months after the previous (Stephens) entry and a year before the next one, which was the first Stevens since 1792. It seems likely that the Brand Hollis Stephens was the same as the Johnson's one as the entry on 2.6.1797 at Brand Hollis' was sandwiched by only 3 to 4 weeks by entries at Johnson's. But no clear identifying evidence yet that it was Alexander Stephens. The last two entries above were after his death so clearly not him