While keeping a finger on the pulse of developments in amateur spectroscopy, I have been watching the recent progress made in spectroheliography, based around a 3D printed instrument the SolEx developed by Christian Buil and software from Valerie Desnoux.
http://www.astrosurf.com/solex/sol-ex-presentation-en.html
From my admittedly limited experience in this field,(I made some crude attempt at it back in 2006 http://www.threehillsobservatory.co.uk/astro/spectra_29.htm )
there appears to have been significant progress in this area over recent years and results look impressive. It seems from this recent post on the SolEx forum
https://groups.io/g/Solex-project/message/4776
they are getting interest from professionals with potential for Pro-Am collaborations. Are any BAA members working in this area ?
Cheers
Robin