Fixed mountain climbing gear. Help please

Looks like I should be able to get hold of a 144 BCD TA chainring with 41T (designed to be a replacement for the old super record chainrings) and Soma Fab do track cogs with 23T.

41:23 gives me 47 gear inches.

• the mrs reminded me last night that the baby we are expecting will, most likely, only be a month old by then. So I'll be doing this event gearless and sleep deprived, fun fun.
  
  

(BTW. If anyone has ever wondered if it is possible to go lower than 41T on a 144 BCD chainset check out the pic)

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