I heard that PIVX wallet runs just fine on rPi for staking. You can also try Semux which is Java based and there's also an option to run it in cli mode.

I am not sure how you can say that, if you look at Dentacoin as an example , with single use proposition , which has created 8 trillion tokens from thin air, and is valued @2 Sat , while B3 is pure crypto coin that can only be earned  by pure mathematics formula utilizing computational  power with ever increasing POS difficulty , having actual intrinsic value based on energy time units of computer power and electricity usage . B3 is going through distribution phase with high reward (10K% to block 80, lowered to (100%) from block 80-100K as a reward to early believers and to  provide widest possible distribution at the same time . The most appropriate advise to give anyone who has low number coins (suggest less than 100M ) at this stage to send to community mining pools , the rewards outweighs the risk, as most likely you will double the coin in 5 days , alternatively , not receiving rewards will dilute your coins on a daily basics, missing out on increased number of coins , and increased value. Also , important to remember, the difficulty will keep going up, so to fully participate in this process until block1M, you will need to stake well or be part of masternodes rewards program , and with 8MB blocks, SegWit. Lightening, Atomic swaps, Decentalized Exchange, listing on much bigger exchanges, with community pools funding marketing, it is impossible to make predication on the value of B3 , and as I continue to give the same consistent advise, if your risk and liquidity allow you, hop on the train, B3 may take you to where you want to go financially, look at the road map, this baby has just began. Although nothing is certain in life , except our own demise (hopefully not before 100) ,  If you like someone, send them some B3, let them stake through the community pools, you may end up having grateful family and  friends for life, you are unlikely to come across a coin (pretty much undiscovered by the masses ) with so much potential for so little fiat tokens.