Yea you can definitely lighten the pull without a Ghost trigger but I personally would not put any aftermarket springs in a Glock. If you want a lighter trigger pull I would order a Glock OEM 4.5lb "minus" connector (Glockmeister should have them in stock) and couple that with a very modest...
The Minwax Bombay Mahogany Stain/Seal combo as mentioned earlier is a great color and super easy to use. I refinished an old Remington Speedmaster .22 with it and it turned out great.