So if I execute the following commands it will work if I understand you correctly
yum install smeserver-extrarepositories-remi-safe
signal-event yum-modify
config set UnsavedChanges no
So far so good, added me I would..
A few minutes of reading the wiki finds what you want to do..
https://wiki.contribs.org/PHP_Software_Collections#Find_other_RPMSyum list available php7\* --disablerepo=* --enablerepo=remi-safe
or
yum list available php71\* --disablerepo=* --enablerepo=remi-safe
Browse the list produced .. yep there they are:
At least you get to say yes or no
# yum install php71-php-gmp --enablerepo=remi-safe
# yum install php71-php-intl.x86_64 --enablerepo=remi-safe
No guarantees, no warranties..