This ought to work.

There will probably need to be more than one of these ‘headstones’, in order to handle all those wanting to pay their respects…
ETA:
I call dibs on a nearby beer & burrito stand.
Nah, just a large enough crypt underneath in order to accomodate all that respect.
Perhaps the methane could be vented off to provide power, & the respect converted into fertilizer… or maybe compacted into bricks for his presidential library.