This type of project would be best suited to the partners, or family and friends. The OP is claiming to have 3btc in the coin that he can get out with just 0.75btc. The developers could either get paid after they made the changes, or the OP could get the money from family and friends.
The fact that neither of these parties trust him is a red flag. He says it's a sure thing, but they don't believe him, and they know him best. Why should we believe him?
not to rain on anyone's parade but the coin is dead regardless. we have 1000 altcoins. does the world really need procoin?
Maybe this type of fundraising would be appropriate for smart contracts then. That is, if OP is so sure that the value of the coin will rise and the devs are OK with delayed payment. The devs will be promised 2 BTC if OP's prediction comes true. The coins could be placed in a multi-sig escrow account and only released when the Procoin price increases. Use an oracle to get the price of the Procoin on an exchange.
There can be always place for some alts.
P.S. Otherwise... a coin needs a lot more than 2 or 3 BTC. I know it from my own experience.
There have been a few coins which had less than that and still turned out to be reasonably successful.