I have also considered doing something like this. Don't know anything about this particular TV, but (based on a quick search) it has a dot pitch somewhere around 80 to 90 pixels per inch (Sony doesn't have a spec on their site). Those pixels would certainly be on the large size, but not too crazy.
I'm using a BenQ 32" QHD screen at its native resolution on my 2018 Mini and have been very happy with it. IIRC, it has a pixel density of about 94 PPI. I don't think I'd want to go any lower than that personally, I always really liked my old Apple 23" Cinema Display and it had a dot pitch of 100 ppi, so I would want to stay in that range.
Now, I'm talking about using the native resolution - which I need for the Windows GIS app I heavily use in a VM. If you use something like the "looks like 1080p" setting then, yeah, that would be really big text.