Is this realistic?

Let's say there's a language with a simple verbal system, having three main
verbal markers:

1. Anterior tense marker.
2. Irrealis mood marker.
3. Non-punctual (progressive) aspect marker.

Thus, the unmarked form of the verb (with respect to TMA) would be aorist
aspect, concomitant tense, and indicative mood.

I want to make the verbal system more complex using only those three
formants above.  Here is what I have in mind:

Aorist + Anterior Tense > Perfect(ive)
Progressive + Anterior Tense > Imperfect(ive)

Is this realistic?  My concern is mainly with the first derivation.

- Rob

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