And how much is your camera? How much will another camera cost? Can it do what your camera can do?
I think the key issue I am considering here is this: Is the cost of another camera that is purpose built to make shooting with wide angle lenses easier worth it to me? Do I shoot with wide angle lenses enough to justify the expense? Or would that money be better spent on film? Learning of other options is helpful in considering whether I should buy another camera or make do with the ones I have. (I will often spend a year or more researching if a camera is worth buying.)
The thing about the Technikas is that using wide angle lenses with them was never very easy. Many of the design choices made in the Master Technika line are simply attempts to make using wide angle lenses a little less miserable. How successful Linhof was might be the subject of some debate. Yes, you can use very wide lenses with the camera, but there are definitely better solutions out there.
A camera like the Walker Titan XL is specifically designed to make using wide angle lenses fairly easy. As I’m sure you are aware, a recessed lens board makes applying tilt and swing adjustments on the front standard a fiddly process since the rear nodal point is pushed well behind the tilt/swing axis. With the Walker, lenses as wide as the SA XL 47mm can be used with a flat lens board.
On the issue of cost, buying a new camera would likely be the cheaper alternative if one were to consider an extreme (and absurd) option of buying three of the above mentioned (#001015) recessed lens boards for the 90, 75 and 65mm lenses that I already own.
The weight of the camera is also an important consideration. The Walker Titan XL is 4.4 lbs. The Master Technika is 6.5 lbs. This can be a serious consideration if one is taking the camera on a long hike.
No camera does everything perfectly. Technikas are big and heavy and work best with mid-range focal length lenses. I think they are great cameras - I have a couple 5x7 models, a few 4x5s and a 6x7 version - but they are not the only good camera in existence. If I only had the resources to afford one camera, I might well limit myself to my Technika IV or my Master Technika, but my resources allow me to consider other options.
You make a good point however about recessed lens boards and I’ll look into finding a deeper one than what I’m currently using. I don’t expect it to make using a 65mm on a 4x5 Technika easy, but it might at least make it possible.