It's certainly possible.
I'm still interested in hearing more views on a test cycle (with the hair loss prevention).
I think NPP - Nandrolone PhenylPropionate - or Deca-Durabolin - nandrolone decanoate - with Finastride is a bad move personally, but each to their own

Let us know how you get on bro.
It may or may not be a myth than using Finastride with Deca would actually increase hair loss if prone as there don't appear to be any studies on this.
But I'd be concerned about the HTPA supression. It's not just hairloss you have to think about with anabolic androgenic steroids.
Deca will surpress natural test levels on it's own, which means you will be putting out less dihydrotestosterone regardless of using finastride or not as there is less test. Any DHT you do have, which will be significantly lower than normal due to the test supression so it should have little effect...especially when you're using things like spiro, minoxidil, A-acid..etc.
As you know, Deca also converts via the 5AR to a less potent form of androgen, DHN, which has very little affinity to binding to the scalp's androgen receptors. So I don't think finastride is nessessary. Of course, still use the other stuff for protection.
I'm not convinced if finastride effects the Deca being reduced or not.
My theory is:
*You take Deca-Durabolin - nandrolone decanoate -
*It reduces natural testosterone
*Reduced natural testosterone = less DHT conversion
*Deca interracts with the 5AR, reduces into DHN
*You now have a combination of Deca and DHN in your system.
*There is still some DHT in your system, but because of the Deca-Durabolin - nandrolone decanoate - , you're natural test is surpressed so DHN becomes the dominant androgen.
*DHN has a low affinity to the scalp tissue, so it's a safer androgen than DHT
Of course DHN could still potential cause some hairloss, as with any androgen. But it's DHT which has a strong binding to the scalp.
So now lets see what adding finastride could/may do:
*You take Deca-Durabolin - nandrolone decanoate -
*It reduces natural testosterone
*Reduced natural testosterone = less DHT conversion
*You take finastride which means even less DHT. This would surpress you even more
*Finastride stops the Deca from reducing via the 5AR into DHN.
*Now you have more Deca in an un-reduced state which may or may not be harsher than both DHT and DHN.
* So now this leaves you with surpressed testosterone, surpressed DHT and surpressed androgenic hormones. In other words, your body becomes completely shut down of any dominant male hormones/androgens besides the Deca-Durabolin - nandrolone decanoate - in it's unreduced state. This potential means estrogen becomes a more dominant hormone in the body.
I'm not sure what effect Deca-Durabolin - nandrolone decanoate - in an un-reduced state would have on the hair or prostate, but it may or maynot be a recipe for disaster. Both from a hairloss point of view and in terms of HTPA surpression.