It's really a tough call I have suffered allergy in the past, mainly pollen and pet dander, seems to be under control and has not bother me for years, now when it comes to be and yellow jacket stings it seems like it never had any effect on me even when stung multiple time in the same area at once.
You can't really ever no how you will react until it actually happens, because you have certain allergies does not mean you would have a reaction and vice versa.
I have owned hognose since 2011 never once got bit and I tend to be a bit magnet does not mean it will never happen but I guess I am willing to take the risk (small risk even when it comes to reactions)
Now if you want something small colorful and with a calm disposition without the risk (granted not as cute) you may want to look into sand boas, there are some very nice mutation, stripes, snow, albino, axanthic, paint etc