Indeed. Good as [sk] forms.

I agree こんにちわ can be considered an ik of "今日は".

I think it makes sense to look at absolute numbers when deciding what to include as sk/sK (something that should maybe be discussed on the Github). I don't think it makes sense to add sk/sK forms that barely register in the ngrams (which we have been doing in some obscure-ish entries), but these misspelled forms (that I think used to be included in the こんにちわ entry or somewhere) do get a couple of thousand hits. I wouldn't mind excluding them but since removing them in the first place did meet with some opposition from Jim (IIRC?), I figured he'd want to include them now that we can do so pretty painlessly.

I think こんにちわ should be tagged as irregular. Also, given that こんにちわ is pronounced identically to こんにちは, I think we can consider こんにちわ a reading of 今日は (and therefore drop the [nokanji] tag).
I don't think "used during daytime" note is needed. It can be inferred from the glosses.
Do we really need こにちわ and こにちは, even as sk forms? Aren't they just typos?

@@ -18 +18 @@
-<re_nokanji/>
+<re_inf>&ik;</re_inf>
@@ -32 +32 @@
-<s_inf>は is pronounced as わ; used during daytime</s_inf>
+<s_inf>は is pronounced as わ</s_inf>