Sure, why not? Would it be "OP"? Comparatively no, not really - any party of 4 melee non-spellcaster characters is always going to be missing out on a *lot* of versatility, and the absence of spells like Pass Without Trace, Enhance Ability, Feather Fall, Sanctuary, and so forth virtually guarantees that there are many scenarios where your options are far more limited than they otherwise might be. But would it be a great time full of zany chicanery and memorable moments, and at times would it *feel* OP? I'd wager yes, and as you say, if you're not having a good time with it you can just respec back out for a marginal cost. I'd love to hear about what your experience is like while playing with such a party.