OK a few things. A force sized similar to GLORIOUS SPARTAN is logistically massive. We are talking about a beefed up wing at least and associated logistics. A unit that size that is organized to be expeditionary and properly equipped takes several days to move and would take many sorties of transport aircraft. Are the Israelis going to use Indian fuel? Can Indian bases support F-15I, F-16I and western logistics aircraft? The Indians operate Soviet and French equipment mostly. That means that if an F-15I has a flat tire on the runway after landing in India the Israelis would not be able to change it! That's just a minor typical issue. I picked the F-15I but it would be worse if one of the IDF refueling tankers had the flat. You should look into how the United States deploys AEF to different theaters and the support requirements. It's a massive undertaking to deploy away from home and operate on foreign soil. It's not something an air force can just do on the fly no matter how good their reputation is.
Now lets talk about OPSEC. Iran may be militarily insignificant compared to the United States. But I would access their capabilities in the SOF/Intel area as on par or superior to the U.S. Military in a lot of areas regionally. Moving a wing from point a to point b over such a distance can cue a lot of sensors both electronic and flesh and blood. For example, Iran probably knows how many planes are at what base, who the unit commanders are and even where they live. What happens when these men are not present for days at a time? Or when a parking ramp in Israel is missing aircraft? What happens when Indian personnel start behaving differently at whatever base the Israelis use? Flying over Pakistan and Afghanistan unannounced would almost certainly be noticed by several nations. There is a huge potential for an incident. Where are all these Israeli planes going to recover? Are they going to egress through Iraq or Saudi Arabia? More issues. Are they going to do like the USA did in 1986 and take the long way home over water? That took over 30 refueling tankers to support! And tactical aircraft are not really designed to fly those kinds of distances which makes the probability of in flight mishap substantial.
The risk factor here is well beyond tolerable levels using India as a staging area IMV. Also, remember that India and Iran trade very heavily in energy supplies. India has an industrial age economy heavily depended on fossil fuels. Any such move and this would directly threaten their growth. Have you considered that? I don't want to go too much into economics or politics but it is a contemporary military issue in regard to basing rights and is the reason why Strategic Bombers and Carriers are so crucial to U.S. Military operations. Israel doesn't have that.
What we are discussing here represents a "band-aid" approach to Israel's tactical problem. They realy don't have the proper force structure to conduct operations like this. They could throw something together of course but the risk are just out of this world for very little gain IMV. They would be better off trying to approach from the west, south or north. But even that would depend heavily on the complicity of other nations.
If they were to do this and it worked at all. The biggest heroes would definitely be the logisticians who managed it because this is a truly mind boggling task and almost unprecidented. One last thing though, it's really hard to ID a tanker over international waters. Not to mention that you can also contract the darn things these days!
http://www.globalairtankerservice.com/
http://www.omegaairrefueling.com/vms/
-DA