Sound absorption coefficients for frequencies higher than 8kHz and lower than 80Hz?
The main reason why the tables don't have it, is that it's hard to measure. The measurement technique in ISO 354:2003 relies on measuring the difference in reverberation times in a reverberation rooms with and with/out a material sample.  At higher frequencies, the reverb time is dominated by air absorption and and the sound field becomes less and less diffuse which violates the basic assumption behind the measurement. It's not uncommon to measure absorption coefficients larger than 1. That's not good !

I wouldn't mingle air absorption and wall absorption. They are different effects and should be modelled separately. They are basically additive. At 20 kHz air absorption is around 50-ish dB/100m. The early reflections in a room have a travel distance of only a few meters so there is some attenuation, but there is still plenty of energy left. 

Keep in mind that wall absorption measurement is NOT done at 8 kHz but it's averaged over the 8 kHz octave, so the data covers frequencies up to 11.5 kHz. If you need to go hire, you can often simply extrapolate to 16 kHz by looking at the difference between the 4 kHz and 8 kHz value. 

Easiest is to extrapolate in dB for the reflection coefficient. Example: 4 kHz = 0.6, 8 kHz = 0.8. Reflection coefficients are 0.4 and 0.2 or -4dB and -7dB respectively. So it's 3 dB drop of reflected energy per octave. Extrapolation yields -10 dB for 16 kHz, which is a reflection coefficient of 0.1 or an absorption of 0.9.

Something like this
$$\alpha_{16} = 1-10^{0.1 \cdot (2 \cdot 10 \cdot \log_{10}(1-\alpha_8)-10 \cdot \log_{10}(1-\alpha_4))}$$