Hahaha I can totally see this being reasonable and practical, but I just can’t think of actual characters for that purpose 
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I think the other on’yomi readings for which I build similar connections are こう (something related to school or public matters), しょう and しょく (usually related to food somehow), because these so far have been the most common.
I could mix other languages into this as well, but for Japanese I prefer to study in English so it’s either the “Japanglish” pronunciation or I don’t even try. Rather, what I do with kun’yomi readings is I repeat them and try to build an emotional attachment to the sounds and a connection between the reading and the meaning via core emotions. For instance, when thinking of 疲れる, I imagine myself working hard and being tired so the つかれ sound is associated with exhaustion and this will be reinforced with 疲れさま and other words. Not to be confused with the つく (making) and つか (using).
Yes, the つく for “attach” might overlap with つく for “making”, but I pronounce them (at least in my head) a little differently.
I was referring to both loan words and Japanese pronunciations of English works like “other” would be pronounced あざ, “ball pen” - ボールペン, etc.