Acid titration of sodium acetate in the presence of sodium ethoxide, is it possible?
The pH of 0.1 M NaAc is calculated to be 8.9. https://pubs.acs.org/doi/pdf/10.1021/ed079p29.1
The pH of NaOH will be much higher. The 30-40% of ethanol may have some effects, but in general, you should be able to add about twice as much NaOH as you think will react with all the EtAc, reflux and back titrate the NaOH. As Poutnik comments, there won't be significant NaOEt.
The reaction will look like this:
EtAc + 2 NaOH --&gt; NaAc + EtOH + NaOH
If you can get some thymolphthalein, you could use that as an indicator.

https://en.wikipedia.org/wiki/PH_indicator
Or, you can use pH paper strips if you are satisfied with a cruder analysis.
Possibly a more intricate back titration might work: add about twice as much NaOH as you think will react with all the EtAc in your ethanol, reflux as above, then add the same number of moles of acetic acid as you added moles of NaOH. Then the reaction will look like this:
EtAc + 2 NaOH --&gt; NaAc + EtOH + NaOH;   reflux;   + 2 HAc --&gt;
NaAc + EtOH + NaAc + H$_2$O + HAc
Then back titrate the excess acetic acid with phenolphthalein (common enough - you must have some). If there were no EtAc in your ethanol, the pH of the solution after adding the 2 HAc will be about 8.9; if there is any EtAc in your ethanol, you will have excess acetic acid due to the saponification of the EtAc. And you back titrate that with NaOH. So this is sort of a back to back titration, or a back and forth.