Chris,
Good on you! Glad to know it all worked out. I did the video today and it is currently processing on YouTube. I hate to show you all a 65 year old guy stumbling around on a kayak but oh well

You don't need a drill press...if you have a 38mm hole saw that you can put into your hand drill and just very gently start from the open end it will do the job. Don't force it, just let it slowly eat it through.
I do have loops pre-tied on both ends that go over the inner pipe. I am using some old flat climbing rope or strap, don't know what you call it but used it for jack lines on the big boat years ago for the straps. Today I found that they float mostly

and had to get wet to get them under the boat.
Other than that things worked pretty good. You could use the single strap as long as you can get it through the tee along with the inner pipe. Or just loop it over the other pre-tied loop.
I am still trying to get the fly worked out. The other thing is that we are always standing in water either in the seat well or the drive well. How do we keep that from happening?
Skipping ahead to the subject that Cowsgomoo brings up......one needs morning coffee and then there is the morning constitution
I will let you know when YouTube has it done.