I think your recipe will taste good but I don't think it will taste much like Inversion. I love Maris and use it all the time but if you really want a clone I would use US 2-row for this. This beer is a fairly light malt taste without any of the biscuit flavor the MO is going to give it. Again I think it will make a good beer but I don't think it will be to close to Inversion.
Just my 2 cents - now go forth and brew
Jubelale Clone, Dirty Dog IIPA
Red Chair NWPA, Dim Wit
Keg: RedShift IPA, Bootstrap IPA, Dos Equis, Albino Pale Ale, Total Domination Clone, Rye IPA, Grant's Perfect Porter, Cascadian Dark Ale, IIPA