I would like to invest but I don't own a bitcoin wallet...
I think it would be wise to accept other alts; ltc, eth, dash
You would most likely receive much more funding
I would also suggest a blogging bounty campaign, those reach more users than on bitcointalk sigs will
Good luck on the crowdsale, I will wait for exchanges.
How can be that a problem? When you can easily get a Bitcoin wallet in a matter of minutes. From Coinbase to Xapo you can choose a wide variety of wallets out there. Also I think that they are accepting other coins, look at the first page of the thread you will see that they are accepting LTC, ETH and Ripple for their Crowdsale Process.
Recently, bitcoin transact through the wallet to another wallet are not been processed in a mintutes of time. It takes a day atleast to completed the transaction with the multiple confirmation in bitcoin. So Eth or litecoin can be used in crowdsale. Nvo announced that they wil raise the funds to design and develop their decentralized exchange in crowdsale. Please refer the news link below.