How to value IMF

Looking for some direction in valuing IMF. Given the somewhat lumpy and volatile nature of IMF's income flow, the usual assessment of P/E and growth outlook is trickier to apply.

In the recent IMF Investor Presentation they note
1) That historically that they generate gross revenue of 15% of EPV.
2) There is approx $5.6billion total EPV of which $2.4b may settle in FY19

But as for case costs I don't know how to assess.

Then there is the 80-90% historical case success rate, though the 15% of EPV statistic already takes that into account so perhaps that is not necessary for the assessment.

A DCF could apply for a valuation using the next three years of EPV and then some terminal value for continuation?

Has anyone seen an analyst valuation calculation. I would be very interested in the assumptions and methodology.

IMF share price now around $2.60. What valuation calculation can this be compared with?

Would appreciate any thoughts or insights.