The JFETs for switching should not be very critical, but the J109 looks like rather high in capacitance. I would consider a more standard PN4393 or J113.
To get a little more withstand voltage for the reed relay at the input, one could consider a photomos switch in series.
There are quite some resistors that effect the gain. The absolute accuracy would likely not matter and could likely be trimmed, but the stabiltiy could be an issue.
Some of the small compensation capacitors would likely depend on the layout and resistor types for parasitic capacitance. So the best values may change a little.