Theres not much substance to your question so why. Whats the goal, whats the reason other then because i have some.
Bare minimum dose id say is 50mg/week to possibly see some joint relief, take that with a grain of salt. Some ppl say any dose makes there joints feel great and otheres say no matter how much they take it dosent do **** for there joints

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If your limited to 200mg of test then your probably limited to 100-200mg max before you notice unfavorable changes in estrogen that may be difficult to control. If your one of the ppl who can run deca hard then skys the limit.
I dont think adding a tiny bit of npp/deca to trt is going to cause any significant changes so if i was looking to make this a cycle and not want to raise my test then i may get a bttl of mast or primo or even eq to add to the total mg or even completely drop npp for one of them. Mast or eq you could probably run significantly higher then test without issues.
If this is a simply because you have thing maybe try 50mg 3x week or 25mg/day