I couldn't imagine needing anything higher than 34/9t.. that's on par with the gearing that Nino uses (38/10t). 34/9 gets you 32.5mph at 100rpm cadence, I couldn't imagine anyone (other than Nino lol) having the power to push faster than that, and if the downhill is steep enough you just shouldn't be pedaling.

Keep in mind that the FM936 geometry is significantly different than previous gen Spark.  I do think the FM936 is the perfect marathon bike, but if you're after more traditional XC geo, then it's not it.  I've got an LCFS911 Spark copy, however it doesn't support over 34t chainring.  I'm switching to an FM936 this year though, longer and slacker without gaining any weight.  Have you considered a cassette with a 9t small cog rather than sticking with 36t chainring?

Lexon is hit or miss, but if they are a miss, you will have no support.  I got burned by them on a gravel frame that was horrible quality.  Their MTB frames do seem to get better reviews, maybe they come out of a different factory, but again if there's an issue, they will not accept responsibility and will not help.

Buy a Carbonda FM936 of FM909. Put whatever chainring on it you like. I won't tell anybody if you don't. Maybe need a chainring with a spacer to clear the chainstays. Maybe not.

                                                                                                                                                 
  Well, for all y'all waiting for that guy to take one for the team, you're in luck, I expect mine at the end of the month.  It will be a 19" with the Deluxe Select + and that rather tasteful Spirit paint theme.  Before ordering, I searched and translated the sparse user reviews and opinions, including from this forum.  All the Scott Spark, and other Scott models employing the same shock arrangement are selling well, perhaps this is why Scott was not entertaining any requests from me to buy a Spark 910 frame only.  What follows are the reasons I decided to toss the dice:

1)  I will not be flogging the bike as hard as some.  I'm going on 68, and mostly ride loamy forest singletracks, albeit briskly for me.  Primary goal is to soften the shock loads to my feet and knees.  I'm looking for a short to mid-travel, full-sprung frame upgrade over my Scott Scale 950 XC hardtail converted ebike. 
2)  The Spirit frame is the cats meow for DIY ebike builders as the frame has an open triangle which facilitates the easy installation of larger, all-day battery packs.  This battery mounting issue is a major challenge for mid drive ebike builders, and leads to some real sh%tty looking builds with insufficient range. 
3)  The best review I found was a Brazilian YouTuber.  He takes that thing on some pretty extreme tracks, and he seems pleased with revised shock linkage parts sent to him by Lexon.  Shame on the manufacturer to release a damn useful frame but then use their customers for beta testing.  In my eyes, supplying revised parts does wash away some of their shame and may keep the project a viable business venture for them.  Or at least keep it alive to make it to the next design fiasco... or the possible patent infringement suit from Scott.  I have some ideas on how to mitigate the shocks air fill port.
4)  Thailand is on favored nation trading status with China, so low shipping and duty, I'm at USD 1,075 with shipping but before duty. 

I'll be running the Ryet UD CF asymmetric rim 29er wheels with Schwalbe 2.4" Wicked Will's, definitely recommend these bargain wheels, been flogging a set hard daily for nearly a year, popped in one new rear bearing.  $287.++ for the pair.  Bike will likely be running the lightweight CYC Photon motor eventually, but will initially be built with a Bafang BBSHD.  Wish me luck!