The biggest potential concern I am aware of is the veggie does not atomize as easily. Thus larger injector nozzle holes in a high volume injector may cause extreme amounts of unburned fuel. Proper heating may help alleviate this as well as careful selection of nozzles.
I am only aware of one case where this may have been an issue. It was posted by DZLJIM awhile back. He had tried running a WVO/diesel blend thru his personally modified injectors and was getting raw fuel spitting out the tailpipes. Don't have a definite on the exact reason this was happening.
There are many others who are running veggie with modified injectors, so I know it is not a universal problem. Basically you should be able to do what you are proposing, but you may run into some unknown territory as you go.