They're not fighting F 35s here. Azerbaijan is barely an airforce,
Honestly Speaking Akash is only useful against Azeri UCAVs, Helicopters, and LiFT aircrafts, it does not have TBM capability so it can not shoot down Air Launched Munitions, or Missiles.
They don't only need AA systems! They need new artillery,new vehicles,they need new radars,EW systems,they need new armored vehicles,modern AT weapons,they need UAVs.
Have you even seen the condition of Armenian Air defense, its ancient, no wonder the karabakh war was a massacare.
Long Range
S-300PT (Modern)
S-300PS (Modern)
Medium-range 2K11 Krug (Ancient)
S-75 Dvina (Ancient)
9K37M Buk-M1 (Barely Usable)
Short-range 2K12 Kub (Barely Usable)
S-125 Pechora (Ancient)
K331MKM Tor-M2KM (Modern)
Point-defence 9K33 Osa (Modern)
9K35M Strela-10 (Barely Usable)
Igla (older versions, Barely Usable)
9K333 Verba (Modern)
9K338 Igla-S (Modern)
Yes Akash is not the most technologically advanced system but it is leagues better than literally everything except S300 and Tor M2 of Armenian Armed Forces and it is the cheapest (arguably Modern) SAM system money can buy, it is a perfect replacement for Armenia's Ancient meduim and short range Air Defence Systems
Can not comment on other things you mentioned but in case of Artillery India is completly overhauling and modernizing Armenian Artillery from Head to Toe, they don't need to look elsewhere.
Garuda 105 (on offer)- Extremely Mobile, Truck Mounted Light Artillery (105mm 37 cal)
MaRG (ordered) - Extremely Mobile, Truck Mounted Meduim Range Artillery (155mm 39 cal)
ATAGS (ordered) - Moderately Mobile, Self propelled Heavy Artillery (155mm 52 cal)