I've got a Vox VX50 GTV(*); this is very small and light and therefore good as a practice amp, but if turned up(**) is capable of being loud enough clean to play at a local jazz jam, which is not bad for a small combo with an 8" speaker. But, it's sometimes difficult to find a good place for it so that everyone can hear clearly and I wonder if it would be worth plugging into the PA as well. But, of course, there's no line out on this amp.
It does have a headphone and also a USB socket, but I don't know if anything useful could be done with those.
If I understand https://www.thomann.de/gb/millenium_die_dibox_passiv.htm correctly, could this be used to send the guitar signal to both amp and PA? If so then presumably the signal the PA receives won't have the amp's effects, modelling etc. applied.
Could the amp perhaps be omitted entirely and some sort of pedal used to connect to the PA (if so, what might suit?). If there's a similarly light/small/loud/clean amp with line out that might be worth getting instead.
(*) https://voxamps.com/wp-content/uploads/2019/11/VX50GTV_VX15GT_OM_EFGSJ1.pdf
(**) Power on full 50W, gain on half, volume a little over half, usually does the trick.