I don't think you'd need to modify anything in the radio. One IC-V8000 would be the receiver and the other would be the transmitter. The problem is usually getting access to Rx audio, Tx audio, PTT, and squelch.
To build a repeater, especially in 2 meter, you're going to need a repeater controller, a duplexer and probably some other filtering. 2 meter is a tough band because the input and output are very close together. Then you put it up in a high location and it's very prone to interference. Setting up a 2 meter repeater is something that's really best saved for experienced techs that know how to do it. If you want to put up a 2 meter repeater you might be better served just buying an actual repeater. You'll still need the duplexer and those are not cheap.
To build a repeater, especially in 2 meter, you're going to need a repeater controller, a duplexer and probably some other filtering. 2 meter is a tough band because the input and output are very close together. Then you put it up in a high location and it's very prone to interference. Setting up a 2 meter repeater is something that's really best saved for experienced techs that know how to do it. If you want to put up a 2 meter repeater you might be better served just buying an actual repeater. You'll still need the duplexer and those are not cheap.
One thing that never gets mentioned when someone wants to put up a repeater is choosing and securing the frequency pair. Sure, you can pick a pair at random and use them, but without going through a recognized coordination group, you run the risk of interfering with an already established repeater. (On 2 meters, this is very likely to happen because of the shortage of available frequency pairs.) If your repeater is uncoordinated and you cause interference with a coordinated repeater, you are the one that has to correct the problem, and that usually entails taking the repeater off the air.
Yeah, speaking of frequency pairs, one wonders at the fairness of the coordinators when some people can manage to have a dozen repeater pairs, usually for private repeaters, and others will be waiting for years for a pair and never get it.
...one wonders at the fairness of the coordinators when some people can manage to have a dozen repeater pairs, usually for private repeaters, and others will be waiting for years for a pair and never get it
And all the "paper repeaters" that are sanctioned but are no longer (or never were) on the air.
The OP doesn't show a QTH, so it's also possible that coordination and channel congestion may not be an issue in their area.