Hi! 
I'm in the same exact boat, so I'll tell you our story. 

My DS is also 4.5 and scored very similar to yours.  He also got a 147 on the wppsi verbal, but his full scale was a couple points lower.  Our gifted school is also quite a drive, but it would be the only option besides homeschooling.  He was accepted for early kindergarten there, which is all day, 5 days a week.  He would still need acceleration or differentiation there, as his strength is reading, and he is at least at a 4th grade level now.
We also have the added issue of many food allergies.  This, along with the long days, plus a long commute are causing me to lean towards homeschooling, at least for k.  We have a week left to decide, still not sure what to do.  
Hopefully your school will grade skip your DS to k once they see him in action.  
As far as DYS, we have achievement numbers but not the iq numbers, that pesky 150!  Anyways, we are going to wait until 6 and test with the wisc, and apply then if the numbers are there.  If not, we'll see how much we have for a portfolio, as we have nothing concrete right now.  Mine also doesn't write well, and is in OT.
I'm not sure this was is any way helpful, but at least we can commiserate. Lol!