Some more detail on “why this is a terrible idea”, so you might understand where I am comming from:
You basicaly want to plant a Warp Disruption Field Generator, wich go on HICs, on an Interdictor, wich usualy have Interdiction Sphere Launchers. The differences are quite obvious: A WDFG can keep its Bubble open as long as the HIC has CAP and HP to spill. The interdictor has 3 launches out of his ISL before it runs into a 1 minute reload.
Range. Oh my God.
A Mobile Large Warp Disruptor II has a Bubbleradius of 40k, and those monsters are allready ginormous!
A fully skilled HIC can run a 25k T2-Bubble (26k if you put ~100m-ISK into a faction-Bubble)
A Interdictor may choose between Surgical Warp Disruption Probes and 10k range, or ‘normal’ Warp disruption Probes and 20k range.
You want 100km Radius. ONE HUNDRED! That is one 200km border-to-border freaking gridfill of a Bubble that, if executed as you say, can be expandet to 300km (150km radius) in less than one minute! Serious question: Are you nuts? Can you even Imagine what this means? This can be translated to: "Sit at Gate with a SniperGang, Wait for Targets to hit grid. They end at the edge of the Bubble and can safely be taken care of. If they are too tanky for your guns, oh nevermind, thanks to:
Time. 5 Seconds. If your enemy is 100k away, thats very much nothing. Cut the Bubble, warp of while your Oponent still compute if it is faster to burn 50k away to have you in Warp-Range or burn 100k to you in order to get a hold on you.
What you want is outperforming both: HIC and Interdictor. That T2-Triglavian Interdictor would make HICs utterly pointless as it outperforms them in every single aspect except HP… but, then again, you dont need a shitton of HP if you can just sit 100k away from the combat. Anything that is fast enough to cover that kind of distance in a reasonable time is EASILY removed by a destroyer-size-and-bonus-hull if it burns straight at said destroyer-sized-hull. Anything that might have enough firepower over that kind of range has serious trouble targeting it before it warps off. This has “Solo-ROFLSTOMP” written all over it, and we don’t need those here.