How to bury a mapping?

How to bury a mapping?

The following works, and by using upper case makes it difficult to
type the sub-string ",HR".

imap ,HR -------1---------2---------3---------4---------5---------6----
<cr>
imap ,ha --,HR
imap ,hf \ ,HR
imap ,hh "-,HR
imap ,hs #-,HR
imap ,hz !-,HR

I would like to bury ,HR so it can not be found.
I would like to use one of the other ,h words.
I would also like it to NOT use any "eval" commands.
It must be compatible with some older vim.

Is it possible?

Something like the following... (which does NOT work).
I have tried several combinations of inoremap, still did not work.

imap ,hz -------1---------2---------3---------4---------5---------6----
<cr>
imap ,ha --,hz
imap ,hf \ ,hz
imap ,hh "-,hz
imap ,hs #-,hz
imap ,hz !-,hz

-Bill

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