I'm not sure that this will help, but I received a very useful e-mail recently from someone I greatly respect, discussing Sri Krishna's words in Gita, and specifically, this section from his post seems somewhat relevant to your question. This is heavily cut and excerpted, so please forgive me if it reads as choppy or strange.
If you take things literally, Sri Krishna did say that worshipping "Me" is supreme and those worshipping "Me" reach "Me"...
By "I" and "Me", Krishna meant the supreme cosmic self (Aatman or Brahman) and not the specific form he occupied then...
Suppose someone worships Krishna, and sees Krishna as the supreme cosmic self WITHIN whom Brahma, Vishnu, Shiva, etc. and all the 14 worlds are created, maintained and destroyed. If one worships Krishna with that attitude and without any desires, one is indeed worshipping "Me" as said by Krishna and one indeed gets "Me" (Self of Veda/Upanishad). One becomes liberated...
One does not do something wrong by just using the word "Shiva" and the right thing by just using the word "Krishna". It's not in the name, but in "attitude".
Indraneela
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Oṁ Indrāya Namaḥ.
Oṁ Namaḥ Śivāya.
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