I think that for this purpose it is more correct to make a separate topic. I have a few more new ideas for upgrading the WR - xxx Xi. And even more - I would try to upgrade 64Xi to 204Xi (similarly, as I decided it with WavePro). Since I have 204Xi, for this I still need 64Xi to compare the design of its input module (attenuator/amplifiers).
______________________________________________
Excuse me. I now saw that you are opposed to "crazy things like motherboard upgrades, option hacks and the like", so this will not be interesting for you, because I plan to replace the motherboard, because installing Win 7 is hardly justified on a platform with Pentium M. And the bandwidth extension, Of course, this also includes the hack options.