I make nitric acid (HNO3) on a regular basis by reacting sulfuric acid (H2SO4) with potassium nitrate (KNO3), such as describe here:

https://vadcpa.com/Val/Project-NitricAcid.php

This also produces a lot of potassium bi-sulfate (KHSO4) as a bi-product. I don't want to just dispose of it, and I would like to recycle it in something useful. I know that I can turn it into potassium sulfate (K2SO4) which I could use as a fertilizer by neutralizing it with potassium carbonate (K2CO3). But since I don't have the latter, I was thinking of neutralizing it with baking soda (NaHCO3) in order to get potassium-sodium sulfate (KNaSO4).

So, I have two questions:

1) Is the following reaction possible and spontaneous:

KHSO4 + NaHCO3 ---> KNaSO4 + H2O + CO2

2) If yes, can KNaSO4 be used as a fertilizer?

Or any other idea of what I could do with my KHSO4?