Coins.ph just added a new feature for their cashout payment that is the Game Credits, where you can cashout your funds from your coins.ph in to Steam Wallet with denomination of (50 PHP, 250 PHP and 500 PHP), the payment fee is a bit high at 45 PHP, but this is the best alternative option if you want to buy Steam Funds with Bitcoin and don’t have PayPal or Credit/Debit Card.
You can also buy Garena Shells and MOLPoints.
If you don’t have Coins.PH account you can register from their site at coins.ph.