Display "r2" as r1?

[PMA]

Hi List.

With many multi-bar rests, my 10-staff StaffGroup in compilation
dies of segmentation fault.  With each multibar rest replaced by
however many R1's, it dies still.

So I've now replaced every R1 with "s2 r2" (which compiles fine),
hoping next to tell Lilypond to *print* that centered "r2" as an r1.

But I don't see a way to persuade it.  Is there a trick that would
accomplish this -- something akin to

           \once \override Rest #'glyph = #"rests.0"  r2

?   (That fails, of course.)

Or, addressing the original problem -- is there a way to make
StaffGroup happy in the first place with multi-bar rests?

Thanks for any consideration.

Best regards,
Pete