Romance Verbal endings

I was contemplating ways to make Montreiano's verbs a little different,
and started to wonder: Is it plausible for the -ir endings to collapse
into the -er class of verbs? I know that in Spanish, it seems the -er verb
class hasn't been very productive, and some have been adopted into the -ir
class of verbs. I was thinking it would be nice to have just two classes,
-er, and -ar, but I want it to also be somewhat realistic. Thoughts?




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