The issue with canning tomatoes in a water bath, with other ingredients added, is that there is a risk that the acidity will be too low. Having done it before, with no ill effects, doesn't make it safe-- it just means you've been lucky so far. Frankly, it's not a risk I'd take. People think, oh, if I get sick, oh well, but botulism is not a simple vomit-and-diarrhea illness. It is a deadly intoxication with neurological effects. The risk of death is lower, now that we have antitoxin available, but it is still not something to take chances with-- even people who receive prompt treatment will often require weeks of supportive care to fully recover. Therefore, I use only canning recipes that have been thoroughly tested by a recognized authority.
Other people may choose to take that risk, and that's their choice, but I personally would not.
OP-- my take on it would be that if you can't find a tested recipe that use the ingredients you want to use, it's probably safer not to use them.