The He-112A competed with Bf109, the He-112B just missed the bus, He-100 was a later project initiated by Heinkel.
The He-100 could maybe have been ready for BOB, but not in high numberss as I see it. Still a few hundred of those...
At the time of the call for Bf-110, the Fw187 was a contender but very light weight for the Serstoerer role. If the Luftwaffe had decided that none of them has the bomb bay required, lets just pick the best long-range fighter it would have been F-187 with He-100 in there if someone remembered what Heinkel had been rambling about.
Just to be clear, you must mean the 112B.
Its tricky to say it would have out-shone the Bf109. That was a very competitive interceptor with the best RoC. But it was a bit faster, well armed and with longer range. Much better choice for BOB indeed, but its questionable what the strategic importance would have been.
A longer more costly BOB for both sides would still have the RAF recycling its pilots and if it leads to the go-ahead for sea lion its probably even worse (probably because of the immense butterflies).