Yeah, that's really dangerous. As a datapoint, I have a couple of 27 inch bikes. I just respoked one wheel, using the old Weinmann rim. I believe that the Araya rims are better. If you have a bike with 27inch wheels and are considering changing over to 700c, a couple of things

For keeping 27 rims: cheaper (no changeover expense), is per the original design (brake arms are proper length, etc.), tire selection is decent but certainly more limited than for 700c, rims are probably not as good as what's available today.

For changing over to 700c: changeover expense, not OEM or original design (must at least adjust brakes, may need different brakes with longer arms), great selection of tires, great selection of rims of higher quality.

Having just respoked two wheels (which was fun) I can say that it's certainly easier just to buy new 700c wheels and probably not much more expensive than just rims. Before you change, check to see if you have 4mm of travel in the brake shoes (that is, can you move the brake shoes 4mm down on the existing brake arms). Else, prepare to find new brakes.

I kept the 27 inchers because both bikes (Schwinn Superior 78 and World Voyageur 73) are semi-classics.

For now, you can just find some good 27 inch tires (I use Panaracer Pasalas, too) and go for it if you want to ride. Good luck!