[Elecraft] SideKar vs PX3

[steve]

I am looking at purchasing a QRPworks SideKar display and USB keyboard 
terminal to use with my KX3.  I guess I have given up waiting for the 
keyboard for the PX3.  Does anyone have experience with the QRPworks 
products and in particular, the SideKar?  I like the idea of macros and 
messages that allow for serial numbers.  I am not sure about logging as 
paper seems fine, but a data file would make it easy to enter contacts 
into LoTW.   My K1EL K42 CW Keyboard also "does" serial numbers and can 
embed the callers callsign into the message.  I CAN use the K1EL 
keyboard for CW but it won't work for PSK31 or RTTY with the KX3 using a 
key input as the KX3 only will do PSK31/RTTY with a paddle (why not 
keyer generated input?).  Since I want to do PSK31 with a keyboard, I 
may be "stuck" with a SideKar without the ability of the PX3 to handle a 
keyboard (and serial numbers)...
What are others using for PSK31 portable (no computer) with your KX3?

73, steve WB3LGC