Love it but wish they were keyboards

I really enjoy the expansion of possibilities. The groupings the creator used spark ideas of new combinations. Love it!
However my one "missing star" is for this: I wish the various groupings had been done not as a separate app, but as emojis usually are.
Even better, do them as sets of keyboards, I mean the symbols actually *on* the keys -- then emoji/symbol/icon keyboards grouped perhaps by simply color, etc. Using the extensions in the normal keyboard, where one holds down a key to get alternates, would greatly expand the number of emoji/icons accessible from a regular keyboard.
Why are emoji always presented in a group instead of mapped onto the keys themselves? I have no idea being a code illiterate if this can be done.
Also wish list: ones most-used emoji be auto-assigned to one of the regular keyboards keys, as *its* alternates. Wed have 8 favorites right in the qwerty board. So much faster!
Having fonts is a blast, and seriously it helps make important texts and memos more memorable.
Again this raises the same question: Why not fonts mapped on a keyboard layout? .... Thanks again for all your work in this!!!

bbbOK about Symbol Pad & Icons for Texting