All water based products resist yellowing. Having said that,I think the orange tint from poly look's natural on pine but to each his own.

You could try Loba 2K Invisible Protect A.T

http://merlebsmith.com/loba-2k-invisible-protect-a-t.html

To save possible disappointment after settling on and applying a product. Touch the wood with a wet finger and notice how color changes. That is a pretty close approximation of how wood will look after most any clear finish is applied. You should also be informed that in time, wood change's color when exposed to light. Cherry turn's a desireiable cherry red,pine turn's orange/yellow regardless of finish if finish is transparant,faster with some,slower with others. Bottom line,read the label to see if color change after application and/or after time is listed.