Yeah, it can be done and actually Andreas have even recommended not to use the ask mode anymore since he thinks it is bit old and might not be completely compatible anymore.
However, since I didn't know what to do and deadline was closing, I figured it was best option to hopefully get it to work on AOS3 by putting that Ask requester there so that at least one of the options would work. But it can be removed.
I think I will make a question to Hollywood forum for someone to explain a bit more about those Display options, since I am actually not sure what I should use, and after I get reply I can make an update which would use the option that they suggest to do.
I haven't really paid much attention to that yet, as I actually have a plan to make my own screen selector system, where user can more freely choose different options for the display. For example, there is option to do scaling either smooth or not, but I don't see an option how user could choose it through requester system, so I am planning on adding my own system where user is asked whether he wants to use smooth scaling or not. Point being, that it should be slow as it is already on Amigas, but if someone has enough power etc. maybe they wish to use the smooth scale for better looks.
Also, the major reason for my own system is that I am planning to make a system where user can choose some different resolution in such way that all the graphics are then converted to that screen resolution, meaning that it wouldn't need to do any scaling during the game.
That while the game by default is 1920x1080, you can choose to remake all the graphics to for example 800x600, and if you then play the game using 800x600, it would be using those new 800x600 graphics instead of the original ones, and this way there would be no need for scaling. I trust this will make the game work at decent speed on at least PPC Amigas. I doubt Classic would be able to handle it even then, unless maybe in 320x256 or something.
I have partially implemented that system there already, but didn't have time to fix it for this AmiGameJam yet, as was barely able to make this playable even. I plan to have much more stuff in this still.