Hi...I share your pain!
I designed a new leveling head (SMA/BNC) for the Tektronix SG 504 Sig gen. that has done well over the last couple years. Sold dozens to instrument labs and companies globally. Most recently to a Sonar development Company in MiddleSex, UK and a electronics lab in Belgium.
I am designing a general purpose Vpeak digital display which will work with any BNC/SMA RF Sig. Gen. This will display a precision Vpeak (0.5 to 5.5V) at any desired frequency so that the signal can be used for calibration of O'Scopes, Spectrum analyzers, NF analyzers, RF Communications gear etc.
Would you be interested in such a device, (2.5" x 1" x1") ?
The accuracy will be equal to or better than the SG5030.