All of those are being done, but none of them are the solution to solving the problem of missing LCAs. Also, the LCAs are needed for the Pak border since the time to react is very low as the bases are just 100-150Km away from the border on either side.
The idea behind the LCA's design is to support our CAPs during an enemy attack. So its all about how quickly they can be scrambled. The Mig-21 takes 1.5 min, LCA will take 2.5-3 min, a twin engine jet takes 5 min.
If a JF-17 is 50Km away from the border, it can cross it within 3-4 min. So that's the time you have to scramble your aircraft and meet it in the numbers needed. Pretty much everything you have mentioned doesn't help counter this. Only the Mig-21, LCA and other single engine jets can.
So if a JF-17 is ready to fire 100Km standoff weapons at our bases that are 100Km away from our own border, then by the time the it covers that distance of 50Km and is ready to fire its bomb, the Mig-21 will be engaging it, LCA will be at altitude facing it, while any twin engine jet will still be taxing towards the runway. Nothing beats the Mig-21 in this mission, while the LCA is the minimum necessary to pull this off. Whereas the twin engine jet is a sitting duck.
Based on the points you have brought up, 1 is what we generally need anyway. 2 will still have blindspots. 3 doesn't help with the IAF's neeed for QRA.
We need Mk1A at the Pak border and we need the extra persistence MWF at the Chinese border for QRA. Right now we are using Mig-21s and Mirage 2000s at both borders.
The alternative is to quickly induct second-hand single-engine jets, but there's nothing available that's immediately able to stand up to the brute capabilities of an AESA-equipped JF-17 with a long range BVR missile, the alternatives are all without AESAs and PL-15/Meteor class weapons. The Gripen E, F-16V and LCA Mk1A are what we need in this class, and none of them operationally exist as of today, and the J-10C is not available. Hence there is no immediate solution until 2024-25, even if all three points you mentioned are carried out to a tee.