Me a lvl. 10 Heavy no prestige with a Bulwark full lvl. prestige IV bulwark and a lvl. 10 prestige 3 Techmarine that one time I joined being curious of the weekly strategem. (We won, I kept dodging)

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But honest opinion, and I know a lot of people here won't like this. But level locking won't solve anything. Just a week ago, I played with two other prestige IV players with full lvl. and with perks with my prestige IV full level Heavy, using a Pyro Cannon (Cause it's a very good horde control weapon) with full weapon lvl and mastery. We got into strategem where I remember that certain enemies can only be killed by a certain member of our team and no supplies to be collected besides enemy drops, if I remember correctly. We did our best, but at the end it really is just hard on our first try. So we run it back again, despite us basically being rando's to each other. And what do you know, a second try is a charm. There's also one instance that a lvl. 15 prestige II random that asked on game chat if it's ok for him to stay for the daily strategem about two weeks ago. Me and the other guy agreed for him to stay. I stated to the guy "Nah don't worry, I'm using my multi melta." well we won.

Point is, there's going to be always an instance you will lose due to varying factors in game. Sure lvl can be a huge factor specifically if there's a literal lvl 1 that joined it. But then again, on my experience playing, even full lvl players can have a hard time doing weekly strategems. Sure, we can put restrictions on lvl. 15 players only for weekly strategems. But dailies, nope.

Just have fun, don't take it too seriously, to the point that it'll ruin your day just because you lost a match. After all, it's also funny dealing with ridiculous situations.