Hi Martin.
I think you know already know what I'm going to say. Absolutely, go for it. As a suggestion can you include a "before and after" demo on the Streetly tapes page.
I'm pretty sure you will have a general "thinning" of the sound as there will be less beating going on between the out of tune notes.
In no way does venturing onto hallowed ground degrade the tron in any way. I'm sure your untouched versions of the sounds will remain for those who want the "warts and all" original. However, the tuned versions will be welcome, and I for one will putting his money where is mouth is and ordering them.
Andy K