Kevin,
Well, not a great idea to try and glue onto the tung oil. The glue needs grain to seep into and grab a hold of. Applying a sealer or any stain will greatly hamper the glue's ability to do this.
What are you glueing on afterwards? Is it possible to cover the area to be glued with tape, thereby keeping it clear of oil? Then remove the tape and glue away. Make sure and do this with a kukri nearby though, just in case.
I would also agree that any oil and a water based stain are not going to get along. But, if you are homebrewing, it may be possible to boil it down to a thick enough liquid (so that it's mostly walnut oils) and then color the tung oil with this.
I use tung oil quite a bit and love it. I usually split it 50/50 with mineral spirits for the first coat. But this might not be what you are looking for if you're going primitive. I suppose mineral spirits are rather primitive too, in their own way.
Shellac is good too (it's bug sh*t!), but takes a little more finesse to apply and also has to be mixed with denatured alcohol.
Danish oils are also good ~ Watco is a leading brand, and they have a Dark Walnut version which is great.
Hope this helps!
~ Bamboo ~