To even ask a question such as "can you do ____ without meditation" speaks of a weakness, namely that of being able to sit and focus the mind. A weakness I see in our generation of ADD and media-crazed, electronic-obsessed children and adults.
Stream entry, means cutting off afflictions which means jhana attainment which means A LOT of meditation had to be done, whether it was sitting cross-legged or reclined.
There is no stream-entry without jhana attainment.
There is no jhana attainment without a tremendous amount of efforts at following the Noble Truths and stilling the mind and reaching effortless stilling of the mind.
The Buddhists that are not meditating are NOT seeking to be enlightened in this lifetime. There are plenty of Buddhists that think that by chanting a mantra they will be able to gain entry into a Buddhist heaven. They are not aware that to be equipped to endure the death process, jhana is required.
It's really up to the individual but I wouldn't consider someone a true Buddhist unless they meditate for countless reasons, one being that most of what the Buddha taught during his entire career regarded attaining the jhanas through many different methods including contemplations and loving-kindness meditations and literally hundreds more.
Meditation is an absolute necessity of the Path.
The methods though are many. Don't make meditation seem like so much work!
Remember: the purpose of meditation, jhana, is actually an extremely pleasurable, clear-minded state, which if you achieve it, will get rid of your defilements because you discover this perfect mental-physical state and it will allow you to feel truly pure and empty of egoic creations and thus highly energetic and be able to multi-task and become extremely, highly functional in the world!
Meditation is not a chore or a dysfunction. It is a pathway to becoming a happier, satisfied, powered-up version of yourself. Minus the ego though (you won't feel like showing off or being hurtful to others).
Anybody that doesn't meditate is not taking the path of self-transformation and self-mastery of their karma, mind, and life.
Anybody that has achieved stream-entry without lots of sitting meditation, has only done so because they have tremendous achievement from past lives and thus that weight of good karma carried over to this present life and enabled them to achieve stream-entry with ease (because they are already familiar with the jhana state and entered it easily).
These are all things the Buddha said.
If you like loving-kindness meditation... then learn to do it really well!
There are stories in the sutta of bodhisattvas who attained jhana, stream-entry and even higher stages through such a method alone!
In fact, the beings in the 1st dhyana-jhana heaven are filled with unconditional boundless love.
Through loving-kindness meditation you can attain jhana. There are plenty of guides on the internet particularly on BuddhaNet.
I reccommend doing one practice you like (you have karmic affinity with it from past lives) and also a method you hate and struggle with (it represents a part of the Path that you have travailed over for countless lifetimes).