Definitely don't keep it to yourself!
I'm actually planning on doing a bit more than that. This one room will help me determine what I'll be doing to my upstairs which also needs hydronic flooring and wall insulation.
The current plan is to do something to further insulate the wall beyond just normal fiberglass batts. Spray foam is a great start for sealing purposes. Perhaps I'll try one of those DIY kits. However, beyond that, I'll also be thickening the wall. I'd like to end up with an R40 wall once everything is said and done, but I think that may be a bit much to ask for. I might have to settle with around R30. Since a traditional wall 2x4 wall is only ~R11 once you take into consideration the thermal bridging, that is quite a step up. I'm thinking of something similar to the
mooney wall. I don't know how deep I'm going to make the wall yet though.