There is little to no chance that Lifetime Platinum is worth 6 years of mattress running 50 nights per year. You can always replicate Platinum benefits by booking a Club room or other special rates that include perks. I know people on Flyertalk will spend 000s to earn benefits they could have just paid $50 for but instead get "for free". But this is a special kind of insanity...

Therefore you do nothing special. Whatever business travel you do gets directed to Marriott. You decide in November each year whether you are close enough to 50 nights to mattress run / staycation Shatin using points.