Wouldn't it be better to split the profit between 6-10-15 people than a couple thousand or mill?
There is a software called
P2Pool, which was more popular in the past, and where people mined their blocks in P2P way. Later, it was replaced by bigger, and more centralized mining pools, because it will not scale, if you want to work with lower difficulty. In general, you mined a block per 30 seconds, with 20 times easier difficulty, than it was in mainnet.
The way p2pool functioned is very different from what OP is trying to achieve, although, a private P2pool instance would be a lot safer than the current centralized solo mining parties that use a centralised pool.
Using p2pool protocol, you can tell for sure the coordinator can't steal your coins if a block is found, but setting that up is costly and requires some IT skills, which is one of the main reasons why p2pool was deemed dead.