The way easyapache works is it does upgrades in stages and then does the checks. If it gets to the checks with Apache then it will leave PHP upgraded. So since you do not care about the Apache portion you should be safe to build the matching PHP and it'll build against the configuration you attempted through cPanel's easyapache.
I would also advise to keep things simple is when you build PHP through easyapache your Apache version is 2.0 with prefork or no mpm specified. Otherwise it builds a thread safe PHP which can cause issues with extensions. This will cause problems if you want to use cPanel/WHM built in Pecl feature to build other extensions. It will build a thread safe version because of the system PHP installed but the version LSWS uses via build matching PHP will not be thread safe. As a result extensions will not work on the LSWS version.