There are probably some involved things here. We have an f(V)r-fr(V) cluster, and anticipation plus the 'articulatory gestures' involved make separating all the phonological goodies a little difficult. What's the word. Not metathesis. Assimilation?
There is also the proclivity for current day English to cliticize prepositions fore and aft. R-dropping here is not 'non-rhoticism' but obedience to some other rule about how rapid idiomatic American speech is to be done.
As for your Northern Illinois accent. Chicago? Northern Cities Vowel Shift? Do you hear 'chopsticks' when someone not of your dialect says 'ChapStix'  (ChapStix is the brand name of a lip balm).
From: Christopher Straughn

In my dialect (Northern Illinois) we always
keep the "r" sound. In fact, a distinguishing trait of my dialect is to overstress the "r" so much that it almost becomes vocalic, and changes the preceeding vowel to @.  We almost seem to say "frr free