Hcg raises aromatase
DBOL raises methyl-estradiol
Test raises E2
Nandrolone does aromatize
I would at the very least have adex on hand,
and I would think estrogen will be pretty high at times during cycle here.
Whether you "get away with it" will depend on whether you do blood tests for E2 and dose AI accordingly (in which case I suspect you'll end up needing an AI), or just go by feel (bloat, hypertension, libido, etc), in which case you might tolerate it.
I have to say though;
The only real way to gauge E2 is by bloodwork.
As for DA, I don't use em, but would if I had easy access and it didn't crash with my Ritalin. Why? Cause one does usually feel better when using em, no matter what prolactin levels are.
And if you're gonna go with (trying) no AI,
then I surely would use a DA agonist with those 19nors.